Question

An element X has a mass number of 16 and an atomic number of 8.

i. Find the valency of X

ii. Name the above element and draw the atomic structure of the same.

iii. How many valence electrons are present in the above atom?

PLS ANS FAST

Answer 1

Answer:

(i) atomic no. =8

so, electronic configuration =2,6

they want 2more electron's to complete it's octave

therefore, valency =2

(ii)

oxygen (O2)

atomic structure you can draw at yourself in 1st shell fill 2e- and in 2nd make 6e-

(iii) 2

Answer 2

i. 8 is the atomic number. So electronic configuration is 2,6. Two more electons are required to complete octet. So valency is -2

ii. Oxygen atom

iii. 6