Question

An element 'M' has atomic number 12.(a) Write its electronic configuration.(b) State the group to which 'M' belongs.(c) Is 'M' a metal or a non-metal.(d) Write the formula of its chloride.

Answer 1

The element with atomic number 12 is Magnesium.
(a) 1s²2s²2p⁶3s² is the electronic configuration of Mg.
(b) Mg is in IIA group .
(c) Mg is a metal.
(d) Magnesium chloride's formula is MgCl₂.

Answer 2

The element M is Magnesium(Mg).

• Magnesium has atomic number 12.

• The electronic configuration of Magnesium is $1s^{2}2s^{2}2p^{6}3s^{2}$. The K shell is filled with 2 electrons, the M shell is filled with 8 electrons and the L shell is incompletely filled with 2 electrons.

• Magnesium (Mg), a chemical element, is an alkaline-earth metal and belongs to group 2 of the periodic table.

• Mg is metal as it has 2 valence electrons in the outermost shell and it loses the 2 electrons to form the +2 positive charge and hence it gains metallic character. So Magnesium is an alkaline earth metal.

• The formula of chloride of magnesium is $MgCl__{2}$