Question

An element X has atomic number $13$
A. Write its electronic configuration
B. State the group to which X belongs
C. Is X a metal or a non metal
D. Write the formula of its bromide

Answer 1

Hint: The distribution of atoms in an orbital is known as electronic configuration. An atom consists of an electron shell which is defined as the set of states that share the same principal quantum number. The ground state is the lowest energy state. Metals have the tendency to lose electrons.

Complete step by step answer:
Here, it is given that the element X has atomic number $13$
A.The electronic configuration of element X:

$K$	$L$	$M$
$2$	$8$	$3$

The valence electrons present are $3$
B.The formula to calculate group number using valence electron are:
$G.N=10+V.E$
This formula gives an idea about the group number using valence electrons
Where, $G.N$ is the group number
$V.E$ is the valence electron
Now, we substitute the values in the above formula we get,
$G.N=10+3$
On further solving we get,
$G.N=13$
Therefore, the group to which X belongs is $13$
The element that has atomic number $13$ is aluminium
C.Yes, X is a metal because it is a good conductor of heat and electricity. It has a high boiling point and melting point and they possess metallic lustre. It has a closed packing that forms a crystalline structure and forms cation in aqueous solution.
D.The bromide ion has the valency $=1$
The X element has the valency $=3$
To calculate the formula of a compound, we should interchange the valencies of each other

Therefore, the formula of metal X with bromide is $XB{{r}_{3}}$ .

Additional information:
In a periodic table, all the elements are arranged in a form of chart. This chart contains groups and periods.
Groups are defined as the vertical columns.
Periods are defined as the horizontal rows.

Note:
1.The total number of protons in a nucleus is defined as an atomic number. Elements are arranged in a periodic table that contains groups and periods according to the atomic number .
2.Valence electrons are defined as the outer shell electrons. For the formation of a single covalent bond, both atoms should contribute one valence electron to form a shared pair.
3.Metals are good conductors of heat and electricity and show high boiling and melting point whereas non-metals are not a good conductor of heat and electricity and do not show high boiling and melting point.