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W an inert gas with the biggest atomic size P an alkali metal in the second period X a halogen that is least active D an element that needs three electrons to become stable and it is found in the third period K an atom that readily yields a 2+ ion in the fourth period B has an electronic configuration of 1s2 2s2 2p6 3s2 3p1 A has 6 protons in its nucleus R has an atomic number one less than A O has an atomic number one more than A S has 8 more protons in its nucleus than D F has only one proton Y is one shell greater than B and they are found in the same group I has the largest atomic number in the group of IVA T is found in the fourth period and having an electronic configuration of 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p4 C an atom that is one period more than U and 1 period less than X
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