{"page":"\u003clink rel=\"stylesheet\" href=\"https://lessonplanet.com/assets/packs/css/resources-c03aa079.css\" /\u003e\n\u003clink rel=\"stylesheet\" href=\"https://lessonplanet.com/assets/packs/css/lp_boclips_stylesheets-517835be.css\" media=\"all\" /\u003e\n\u003cdiv data-title='What Is An Atom - Part 1' data-url='/boclips/videos/611cf442463a722cc9b3a931' data-video-url='/boclips/videos/611cf442463a722cc9b3a931' id='bo_player_modal'\u003e\n\u003cdiv class='boclips-resource-page modal-dialog panel-container'\u003e\n\u003cdiv class='react-notifications-root'\u003e\u003c/div\u003e\n\u003cdiv class='rp-header'\u003e\n\u003cdiv class='rp-type'\u003e\n\u003ci aria-hidden='true' class='fai fa-regular fa-circle-play'\u003e\u003c/i\u003e\nVideo\n\u003c/div\u003e\n\u003ch1 class='rp-title' id='video-title'\u003e\nWhat Is An Atom - Part 1\n\u003c/h1\u003e\n\u003cdiv class='rp-actions'\u003e\n\u003cdiv class='mr-1'\u003e\n\u003ca class=\"btn btn-success\" data-posthog-event=\"Signup: LP Signup Activity\" data-posthog-location=\"body_link_boclips\" data-remote=\"true\" href=\"/subscription/new\"\u003e\u003cspan\u003e\u003cspan\u003eGet Free Access\u003c/span\u003e\u003cspan class=\"\"\u003e for 10 Days\u003c/span\u003e\u003cspan\u003e!\u003c/span\u003e\u003c/span\u003e\u003c/a\u003e\n\u003c/div\u003e\n\u003c/div\u003e\n\u003c/div\u003e\n\u003cdiv class='rp-body'\u003e\n\u003cdiv class='rp-info'\u003e\n\u003cdiv aria-label='Hide resource details' class='rp-hide-info' role='button' tabindex='0'\u003e\u0026times;\u003c/div\u003e\n\u003ci aria-label='Expand resource details' class='rp-expand-info fai fa-solid fa-up-right-and-down-left-from-center' role='button' tabindex='0'\u003e\u003c/i\u003e\n\u003ci aria-label='Compress resource details' class='rp-compress-info fai fa-solid fa-down-left-and-up-right-to-center' role='button' tabindex='0'\u003e\u003c/i\u003e\n\u003cdiv class='rp-rating'\u003e\n\u003cspan class='resource-pool'\u003e\n\u003cspan class='pool-label'\u003ePublisher:\u003c/span\u003e\n\u003cspan class='pool-name'\u003e\n\u003cspan class='text'\u003e\u003ca data-publisher-id=\"30356647\" href=\"/search?publisher_ids%5B%5D=30356647\"\u003eFuseSchool\u003c/a\u003e\u003c/span\u003e\n\u003c/span\u003e\n\u003c/span\u003e\n\u003c/div\u003e\n\u003cdiv class='rp-description'\u003e\n\u003cspan class='short-description'\u003eLearn the basics about the atom, whilst learning about properties of matter. Atoms are the small bits that make up all the matter in the world around us. There are around one hundred different sorts of atom, from the lightest, hydrogen...\u003c/span\u003e\n\u003cspan class='full-description hide'\u003eLearn the basics about the atom, whilst learning about properties of matter. Atoms are the small bits that make up all the matter in the world around us. There are around one hundred different sorts of atom, from the lightest, hydrogen to the many times bigger uranium. Materials that are made only of one sort of atoms are called elements, and materials that are made of different kinds of atoms bonded together are called compounds. Most of the elements have symbols that start with the same letter as their name. The exceptions are often symbolised by a name derived from another language, like Pb for lead. The second letter of the symbol is always lower case. The periodic table was constructed by Dmitri Mendeleev. The periodic table is organised so that elements with similar properties are arranged in columns. The periodic table could go on forever as atoms get more and more massive, but very heavy atoms are not stable and fall apart easily. This is because atoms are made up of smaller particles, called protons, neutrons and electrons. Protons and neutrons sit in a small central nucleus, whilst electrons orbit around the outside. The mass of an electron is about one thousandth of the mass of a neutron or a proton, which means that almost all of the mass of an atom is concentrated in the centre, at the nucleus. Because the mass of the proton and neutron are so much bigger than the mass of the electron, we say that the mass of the electron is essentially zero. The number of protons cannot change. The number of protons must also be the same as the number of electrons in a neutral atom of the element. Because electrons are freely moving around the nucleus in an atom, they can be gained, lost, or shared with other atoms, providing the chemistry of the atom. When an atoms gains or loses electrons, it becomes charged. Charged atoms are called ions. Electrons surrounding the nucleus of an atom aren’t completely free. They are restricted to moving in fixed orbitals, or energy levels. The number of electrons each shell can take can be seen by looking at the rows of the periodic table. Neutrons do not have a charge, and do not affect the chemistry of an atom. Atoms of the same element may have different numbers of neutrons, these are known as isotopes. If there are too many neutrons in a nucleus, it might be so massive that it becomes unstable, and liable to split up into smaller atoms. This is known as radioactivity. In the periodic table, elements are written with a small number and a bigger number next to the symbol. The smaller number is the atomic number, which tells us how many protons there are. The bigger number is the atomic mass number. It depends on the weight of the nucleus, that is, the number of protons plus the number of neutrons.\u003c/span\u003e\n\u003c/div\u003e\n\u003cdiv class='action-container flex justify-between'\u003e\n\u003cbutton aria-expanded='false' aria-label='Read more description' class='rp-full-description' type='button'\u003e\n\u003ci class='fai fa-solid fa-align-left'\u003e\u003c/i\u003e\n\u003cspan id='read_more'\u003eRead More\u003c/span\u003e\n\u003c/button\u003e\n\u003cdiv class='rp-report'\u003e\n\u003c/div\u003e\n\u003c/div\u003e\n\u003cdiv aria-labelledby='resource-details-heading' class='rp-info-section'\u003e\n\u003ch2 class='title' id='resource-details-heading'\u003eResource Details\u003c/h2\u003e\n\u003cdiv class='rp-resource-details clearfix'\u003e\n\u003cdiv class='detail'\u003e\n\u003cdl\u003e\n\u003cdt\u003eCurator Rating\u003c/dt\u003e\n\u003cdd\u003e\u003cspan class=\"star-rating\" aria-label=\"4.5 out of 5 stars\" role=\"img\"\u003e\u003ci class=\"fa-solid fa-star 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online courses video science videos, student, fuseschool, global education, ict4d, materials, symbol, mass number, atomic numner, periodic table, nucleus, properties, letter, stable, atom, video, kinds, constructed, change, made, element, lead, mendel, massive, electron, neutron, proton, bigger, number\u003c/div\u003e\n\u003cdiv class='keyterms-toggle-buttons' data-identifier='Boclips::VideoDecorator611cf442463a722cc9b3a931'\u003e\n\u003cbutton aria-expanded='false' class='more btn-link' type='button'\u003e\n\u003cspan\u003eShow More\u003c/span\u003e\n\u003ci aria-hidden='true' class='fa-solid fa-caret-down ml5'\u003e\u003c/i\u003e\n\u003c/button\u003e\n\u003cbutton aria-expanded='true' class='less btn-link' style='display: none;' type='button'\u003e\n\u003cspan\u003eShow Less\u003c/span\u003e\n\u003ci aria-hidden='true' class='fa-solid fa-caret-up ml5'\u003e\u003c/i\u003e\n\u003c/button\u003e\n\u003c/div\u003e\n\u003c/div\u003e\n\u003c/div\u003e\n\u003cdiv aria-labelledby='classroom-considerations-heading' class='rp-info-section'\u003e\n\u003ch2 class='title' id='classroom-considerations-heading'\u003eClassroom Considerations\u003c/h2\u003e\n\u003cdiv class='classroom-considerations'\u003e\u003cdiv class='fai fa-solid fa-bell'\u003e\u003c/div\u003eBest For: Explaining a topic\u003c/div\u003e\u003cdiv class='classroom-considerations'\u003e\u003cdiv class='fai fa-solid fa-bell'\u003e\u003c/div\u003eVideo is ad-free\u003c/div\u003e \n\u003c/div\u003e\n\u003cdiv aria-labelledby='educator-ratings-heading' class='rp-info-section'\u003e\n\u003ch2 class='title sr-only' id='educator-ratings-heading'\u003eEducator Ratings\u003c/h2\u003e\n\u003cdiv id=\"educator-ratings-root\"\u003e\u003c/div\u003e\u003cdiv id=\"all-educator-ratings-root\"\u003e\u003c/div\u003e\u003cdiv id=\"educator-rating-form-root\"\u003e\u003c/div\u003e\n\u003c/div\u003e\n\u003c/div\u003e\n\u003cdiv class='rp-resource'\u003e\n\u003cdiv aria-label='Show resource details' 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