An element X belong to 3rd periods and group II of the periodic table state: (a) the number of valence electrons, (b) the valency,
An element X belong to 3rd periods and group II of the periodic table state:
(a) the number of valence electrons,
(b) the valency,
(c) name of the element,
(d) whether it is a metal or a non-metal.
5 views
1 Answers
(a) Since it belongs to period 3 it has 3 shells, K, L and M. The outermost M shell will have 2 valence electrons as it is placed in group II
(b) With 2 valence electrons, its valency will be 2.
(c) Since it has electronic configuration of 2, 8, 2, its atomic number is 12 and hence X is Magnesium
(d) It is a metal.
5 views
Answered