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The mass number of an anion, X3- is 14. If there are ten electrons in the anion, the number of neutrons in the nucleus of atom, X2 of the element will be:
(1) 10
(2) 14
(3) 7
(4) 5
Ans: 7
Elements of Group 13 are less metallic than those of groups 1 and 2. Within the group, there is a variation in metallic character. Boron, the smallest element in this group is a no
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When the principal quantum number(n= 3) , the possible values of azimuthal quantum number(l ) is: (1) 0, 1, 2, 3 (2) 0, 1, 2 (3) - 2, - 1, 0, 1, 2
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