Question

The value of four quantum number for the last
electron of atom of element "X" are
S=+(or)-
n=7,1 = 1, m= land
2 and value of
spin magnetic momentum for element "X" is
zero .Element "X" has two isotopes
(1) X and (IT)
(Given : "B - A = B-22 =18", where A and B are
atomic masses and Z is atomic number)​

Answer 1

Explanation:

KLM

286

(a) Since, it has 6 valence electrons, it belongs to group no. 16.

(b) It has 3 Valence shells, so it belongs to period no 3.

(c) The number of valence electron is 6.

(d) The valency of E is 2 because it requires 2 electrons to achieve its stability .

(e) It is a non-metal