{"id":7633,"date":"2018-04-30T19:30:30","date_gmt":"2018-04-30T19:30:30","guid":{"rendered":"https:\/\/www.experimentoscientificos.es\/?page_id=7633"},"modified":"2018-11-26T11:47:26","modified_gmt":"2018-11-26T11:47:26","slug":"helio","status":"publish","type":"page","link":"https:\/\/www.experimentoscientificos.es\/en\/helio\/","title":{"rendered":"Helio"},"content":{"rendered":"<p>Helium is the second element in the <a href=\"https:\/\/www.experimentoscientificos.es\/en\/tabla-periodica\/\">periodic table<\/a>. It is a monoatomic gas, which does not react with other elements. Hence its characteristic as a noble gas.<\/p>\n<p>Helium is the second lightest and second most abundant element in the observable universe, making up 24 % of the mass of the elements present in our galaxy.<\/p>\n<h2>PHYSICO-CHEMICAL PROPERTIES OF HELIUM<\/h2>\n<p><strong>Atomic number:<\/strong> 2<br \/>\n<strong>Atomic mass:<\/strong> 4,0026u<br \/>\n<strong><a href=\"https:\/\/www.experimentoscientificos.es\/en\/densidad\/\">Density<\/a>:<\/strong> 0.1785 kg\/m3<br \/>\n<strong>Atomic radius (calc)<\/strong>: 31 pm (Bohr radius)<br \/>\n<strong>Group, period, block:<\/strong> 18, 1, s<br \/>\n<strong>Name, symbol, number:<\/strong> Helium, He, 2<br \/>\n<strong>Ordinary status:<\/strong> Gas<br \/>\n<strong><a href=\"https:\/\/www.experimentoscientificos.es\/en\/punto-de-fusion\/\">Melting point<\/a>:<\/strong> 0.95K (at 2.5 MPa)<br \/>\n<strong><a href=\"https:\/\/www.experimentoscientificos.es\/en\/punto-de-ebullicion\/\">Boiling point<\/a>: <\/strong>4.22 K (-269 \u00b0C)<br \/>\n<strong><a href=\"https:\/\/www.experimentoscientificos.es\/en\/calor-especifico\/\">Specific heat<\/a>: <\/strong>5193 J\/(K-kg)<\/p>\n<p><strong>n\u00baCAS: <\/strong>7440-59-7<br \/>\n<strong>EINECS no: <\/strong>231-168-5<\/p>\n<h2>ATOMIC STRUCTURE OF HELIUM. ISOTOPES<\/h2>\n<p>The <a href=\"https:\/\/www.experimentoscientificos.es\/en\/atomo\/\">atom<\/a> helium consists of two electrons orbiting a nucleus containing two protons together with one or two neutrons, depending on the isotope.<\/p>\n<p>The most common isotope, the\u00a0<strong><sup>4<\/sup>He<\/strong>consists of 2 neutrons and 2 protons in the nucleus. It is produced on Earth by the decay of heavier radioactive elements; the alpha particles that appear are atoms of\u00a0<sup>4<\/sup>I have completely ionised. The\u00a0<sup>4<\/sup>He has an unusually stable nucleus because its nucleons are arranged in complete layers. Moreover, this isotope was formed in large quantities during the Big Bang.<sup id=\"cite_ref-bigbang_29-0\" class=\"reference separada\"><\/sup><\/p>\n<p>He is the other common isotope of helium. It consists of 2 protons and a neutron in the nucleus. There is only 1 \u00b3He isotope for every million \u00b3He isotopes.\u00a0<sup>4<\/sup>He. This isotope is present on earth today only in trace amounts (most of it comes from the formation of the earth), although some of it falls to earth by being trapped in cosmic dust.<sup id=\"cite_ref-heliumfundamentals_30-0\" class=\"reference separada\"><\/sup><\/p>\n<h2>USES OF HELIUM<\/h2>\n<p><strong>Balloons, Zeppelins<\/strong>Helium is lighter than air, as is hydrogen, but unlike hydrogen, it is not flammable, so it is used as a filler gas in balloons and zeppelins for advertising, atmospheric research and even military reconnaissance. Helium is somewhat denser than hydrogen and therefore has a somewhat lower buoyancy, which is also a good thing in these cases.<\/p>\n<p><strong>Fun<\/strong>Helium is less dense than atmospheric air, so it changes the timbre (not the pitch) of a person's voice when inhaled. Helium moves faster through the spaces, causing the vocal cords to move at a faster rate, resulting in a faster, and therefore higher pitched, sound wave. Inhalation can be dangerous due to the risk of asphyxiation from lack of oxygen and the number of contaminants that may be present.<\/p>\n<p><strong>Cylinders for immersion:<\/strong> Helium-oxygen mixtures are used for deep diving because helium is inert, less soluble in blood than nitrogen and diffuses 2.5 times faster than nitrogen, which reduces the time required for decompression.<\/p>\n<p><strong>Refrigerant:<\/strong> Due to its low liquefaction and evaporation point, it can be used as a refrigerant in extremely low temperature applications, such as superconducting magnets and cryogenic research at temperatures close to absolute zero.<\/p>\n<h2>HELIUM COMPOUNDS<\/h2>\n<p>Since helium is a noble gas, it does not react with other chemical compounds. Under the influence of electric discharges or bombarded with electrons, it can form compounds.<\/p>\n<p>&nbsp;<\/p>","protected":false},"excerpt":{"rendered":"<p>Helium is the second element on the periodic table. It is a monoatomic gas, which does not react with other elements. Hence its characteristic as a noble gas. Helium is the second lightest and the second most abundant element in the observable universe, making up 24 % of the mass of the elements present in our galaxy.<\/p>","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Helio<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.experimentoscientificos.es\/en\/helio\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Helio\" \/>\n<meta property=\"og:description\" content=\"El helio es el segundo elemento de la tabla peri\u00f3dica. Es un gas monoat\u00f3mico, que no reacciona con otros elementos. De ah\u00ed su caracter\u00edstica como gas noble. El helio es el segundo elemento m\u00e1s ligero y el segundo m\u00e1s abundante en el\u00a0universo\u00a0observable, constituyendo el 24\u00a0% de la masa de los elementos presentes en\u00a0nuestra galaxia PROPIEDADES [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.experimentoscientificos.es\/en\/helio\/\" \/>\n<meta property=\"og:site_name\" content=\"Experimentos Cient\u00edficos\" \/>\n<meta property=\"article:modified_time\" content=\"2018-11-26T11:47:26+00:00\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Estimated reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.experimentoscientificos.es\/helio\/\",\"url\":\"https:\/\/www.experimentoscientificos.es\/helio\/\",\"name\":\"Helio\",\"isPartOf\":{\"@id\":\"https:\/\/www.experimentoscientificos.es\/#website\"},\"datePublished\":\"2018-04-30T19:30:30+00:00\",\"dateModified\":\"2018-11-26T11:47:26+00:00\",\"breadcrumb\":{\"@id\":\"https:\/\/www.experimentoscientificos.es\/helio\/#breadcrumb\"},\"inLanguage\":\"en-GB\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.experimentoscientificos.es\/helio\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.experimentoscientificos.es\/helio\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Inicio\",\"item\":\"https:\/\/www.experimentoscientificos.es\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Helio\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.experimentoscientificos.es\/#website\",\"url\":\"https:\/\/www.experimentoscientificos.es\/\",\"name\":\"Experimentos Cient\u00edficos\",\"description\":\"\",\"publisher\":{\"@id\":\"https:\/\/www.experimentoscientificos.es\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.experimentoscientificos.es\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"en-GB\"},{\"@type\":\"Organization\",\"@id\":\"https:\/\/www.experimentoscientificos.es\/#organization\",\"name\":\"Experimentos Cient\u00edficos\",\"url\":\"https:\/\/www.experimentoscientificos.es\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-GB\",\"@id\":\"https:\/\/www.experimentoscientificos.es\/#\/schema\/logo\/image\/\",\"url\":\"https:\/\/www.experimentoscientificos.es\/wp-content\/uploads\/2025\/01\/cropped-logo-exp-grande-transparente_300.png\",\"contentUrl\":\"https:\/\/www.experimentoscientificos.es\/wp-content\/uploads\/2025\/01\/cropped-logo-exp-grande-transparente_300.png\",\"width\":300,\"height\":92,\"caption\":\"Experimentos Cient\u00edficos\"},\"image\":{\"@id\":\"https:\/\/www.experimentoscientificos.es\/#\/schema\/logo\/image\/\"}}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Helio","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.experimentoscientificos.es\/en\/helio\/","og_locale":"en_GB","og_type":"article","og_title":"Helio","og_description":"El helio es el segundo elemento de la tabla peri\u00f3dica. Es un gas monoat\u00f3mico, que no reacciona con otros elementos. De ah\u00ed su caracter\u00edstica como gas noble. El helio es el segundo elemento m\u00e1s ligero y el segundo m\u00e1s abundante en el\u00a0universo\u00a0observable, constituyendo el 24\u00a0% de la masa de los elementos presentes en\u00a0nuestra galaxia PROPIEDADES [&hellip;]","og_url":"https:\/\/www.experimentoscientificos.es\/en\/helio\/","og_site_name":"Experimentos Cient\u00edficos","article_modified_time":"2018-11-26T11:47:26+00:00","twitter_card":"summary_large_image","twitter_misc":{"Estimated reading time":"3 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.experimentoscientificos.es\/helio\/","url":"https:\/\/www.experimentoscientificos.es\/helio\/","name":"Helio","isPartOf":{"@id":"https:\/\/www.experimentoscientificos.es\/#website"},"datePublished":"2018-04-30T19:30:30+00:00","dateModified":"2018-11-26T11:47:26+00:00","breadcrumb":{"@id":"https:\/\/www.experimentoscientificos.es\/helio\/#breadcrumb"},"inLanguage":"en-GB","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.experimentoscientificos.es\/helio\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/www.experimentoscientificos.es\/helio\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Inicio","item":"https:\/\/www.experimentoscientificos.es\/"},{"@type":"ListItem","position":2,"name":"Helio"}]},{"@type":"WebSite","@id":"https:\/\/www.experimentoscientificos.es\/#website","url":"https:\/\/www.experimentoscientificos.es\/","name":"Experimentos Cient\u00edficos","description":"","publisher":{"@id":"https:\/\/www.experimentoscientificos.es\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.experimentoscientificos.es\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"en-GB"},{"@type":"Organization","@id":"https:\/\/www.experimentoscientificos.es\/#organization","name":"Experimentos Cient\u00edficos","url":"https:\/\/www.experimentoscientificos.es\/","logo":{"@type":"ImageObject","inLanguage":"en-GB","@id":"https:\/\/www.experimentoscientificos.es\/#\/schema\/logo\/image\/","url":"https:\/\/www.experimentoscientificos.es\/wp-content\/uploads\/2025\/01\/cropped-logo-exp-grande-transparente_300.png","contentUrl":"https:\/\/www.experimentoscientificos.es\/wp-content\/uploads\/2025\/01\/cropped-logo-exp-grande-transparente_300.png","width":300,"height":92,"caption":"Experimentos Cient\u00edficos"},"image":{"@id":"https:\/\/www.experimentoscientificos.es\/#\/schema\/logo\/image\/"}}]}},"_links":{"self":[{"href":"https:\/\/www.experimentoscientificos.es\/en\/wp-json\/wp\/v2\/pages\/7633"}],"collection":[{"href":"https:\/\/www.experimentoscientificos.es\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.experimentoscientificos.es\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.experimentoscientificos.es\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.experimentoscientificos.es\/en\/wp-json\/wp\/v2\/comments?post=7633"}],"version-history":[{"count":0,"href":"https:\/\/www.experimentoscientificos.es\/en\/wp-json\/wp\/v2\/pages\/7633\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.experimentoscientificos.es\/en\/wp-json\/wp\/v2\/media?parent=7633"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}