Question

The atomic number of an element X is 8 and that of element Y is 12. Write down the symbols of the ions you would expect to be formed from their atoms.

Lakhmir Singh Chemistry Class 10

Answer 1

Element X = 8 (2,6)=oxygen

Element Y = 12 (2,8,2)=magnesium

Element X will have the ionic charge of X2- whereas Element Y will have the ionic charge of X2+

Answer 2

Answer:

So symbols of the oxygen ion=$O^{-2}$

So symbols of the magnesium ion=$Mg^{+2}$

Explanation:

Since we know that atomic number is the protons which is available in the nucleus of an atom.

The atomic number of an element X is 8 so it is oxygen.

since valency of oxygen is 2.It can take two electron to complete its shell.

so symbols of the oxygen ion=$O^{-2}$

The atomic number of an element Y is 12 so it is Magnesium.

since valency of magnesium is 2.It can take give electron to complete its shell.

so symbols of the magnesium ion=$Mg^{+2}$