Question

An element Y is in second period and group 16 of the periodic table
(i) Is it a metal or non-metal?
(ii) What is the number of valence electrons in its atom?
(iii) What is its valency?
(iv) What is the name of the element?
(v) What will be the formula of the compound formed by Y with sodium?

Answer 1

(i)  It  is  a  non  metal.

(ii)  Number  of  valence  electrons = 6

(iii) Valency = 2-

(iv) Oxygen

(v) $Na_2O$

Answer 2

Answer:

i) it is non-metal

ii) this atom have six valance electrons

iii) it has the valency of -2 ( it can accept two electrons from another atom)

iv) the name of this element is oxygen

v) it can form following compounds on the reaction with sodium:

Sodium oxide (Na2O)

Sodium peroxide (Na2O2)

Sodium superoxide (NaO2)