Question

atomic numbers of elements are a and b are 12 and 8 respectively they combine together write down the formula and nature of bonding in the compound

Answer 1

The element a is Magnesium Mg have the valency +2

The element b is Oxygen O have the valency - 2

Thus, the formula will be MgO

Answer 2

$\Longrightarrow{\boxed{\bold{Answer: MgO }}}$

$\textbf{\underline{Step-by-step explanation :- }}$

➣ Element of atomic number 12 = Mg ( Magnesium )

➣ Element of atomic number 8 = O ( Oxygen )

➣ So, when they react together

➣ We must remember their valence.

➣ Valency of Mg = + 2

➣ Valency of O = - 2

( ✪ How to get valency? Please see image. ✪ )

✍️ ✍️ ✍️ ✍️ ✍️ ✍️ ✍️ ✍️ ✍️

So, $Mg^{+2} + O^{-2}$ ➜ $Mg_2 O_2$ ➜ MgO

[ ✪ Here, + 2 and - 2 valencies cancelled out ✪ ]

$\textbf{\underline{Hence resultant is MgO.}}$

$\boxed{\bold{\underline{\red{MgO= Magnesium\:Oxide}}}}$