Question

An element belongs to period 2 and group 2 the number of valence electrons in the atoms of this element is
(a) 2
(b) 4
(c) 3
(d) 1

Answer 1

Answer:

2 valence electrons.

Explanation:

The element referred to here is Berrylium which has electronic configured 1s2 2s2 or 2,2.

Answer 2

An element belongs to period 2 and group 2 the number of valence electrons in the atoms of this element is 2. (Option a)

• If we observe the modern periodic table,then we will find that berillyum is situated in the second period and second group position of the periodic table.

• Now,the berillyum has a total of 4 electrons,so it's electronic configuration will be 1s2 2s2.

• So, it's valence electron number will be two because it's last orbital has only two electrons.