Question

Magnesium reacts with an element (X) to forman ionic compound. If the ground stateelectronic configuration of (X) is 1s² 2s² 2p³,the simplest formula for this compound is
(1) Mg₂X (2) MgX₂
(3) Mg₂X₃ (4) Mg₃X₂

Answer 1

Answer:

Mg3X2

Explanation:

X=nitrogen

Mg+N2=Mg3N2

Answer 2

Answer:

$4) \: Mg_3X_2 \:$

Explanation:

If the Ground state electronic configuration of (X) is 1s² 2s² 2p³

Then,

it's Atomic number is 7

And the element is N (Nitrogen)

Mg has 2 valence electrons in outer most cell

and

N has 3 valence electrons in outer most cell

$Mg \: \: \: \: \: N \\ \\ 2 \: \: \: \: \: \: \: \: \: \: 3 \\ \\ Mg_ 3N_ 2 (by \: cross \: multiplication)$

Hence,

The simplest Formula for this compound is

$Mg_3X_2 \:$