Boron group element: Boron group element, any of the six chemical elements constituting Group 13 (IIIa) of the periodic table. The elements are boron (B), aluminum (Al), gallium (Ga), indium (In), thallium (Tl), and nihonium (Nh).
This is a quick reference of elements that are new or have been redefined in HTML5. For each element there is a short description, a link to the specification, and a code example. “Our prognosis” links to the HTML5 Doctor article on the element. There are more articles in the Article Archive
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The octet rule says “Main-group elements lose, gain or share electrons in such a way as to achieve an outer shell with eight electrons, ns 2 np 6 that matches the nearest rare-gas (noble-gas) electron configuration.”
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New Jersey Department of Environmental Protection-Radiation Protection Element
In chemistry, a group (also known as a family [citation needed]) is a column of elements in the periodic table of the chemical elements.There are 18 numbered groups in the periodic table, and the f-block columns (between groups 3 and 4) are not numbered.
Actinoid element: Actinoid element, any of a series of 15 consecutive chemical elements in the periodic table from actinium to lawrencium (atomic numbers 89–103).
Group 3 is a group of elements in the periodic table.This group, like other d-block groups, should contain four elements, but it is not agreed what elements belong in the group.
