An element 'M' belongs to group 1 and period 3 and another element 'X' belongs to group 15 and period 2. Which of the following statements is true about the compound formed between 'M' and 'X' ?

Question

An element 'M' belongs to group 1 and period 3 and another element 'X' belongs to group 15 and period 2. Which of the following statements is true about the compound formed between 'M' and 'X' ?

An ionic compound is formed by transfer of three electrons from an atom of element 'X' to an atom of element 'M'.
An ionic compound is formed by transfer of three electrons from three atoms of element 'M' to an atom of element 'X'.
An ionic compound is formed by transfer of one electron from an atom of element 'M' to an atom of element 'X'.
An ionic compound is formed by transfer of three electrons from an atom of element 'M' to an atom of element 'X'.

LohaHridoy

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2025-01-04 04:42

1 Answers

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AhmedNazir · Accepted Answer · 2022-09-04T04:29:57+06:00

Option 2 : An ionic compound is formed by transfer of three electrons from three atoms of element 'M' to an atom of element 'X'.

The correct answer is An ionic compound is formed by the transfer of three electrons from three atoms of element 'M' to an atom of element 'X'.

Concept:

Valency:

The number of electrons lost or gained by an atom is called valency.
Valency = valence electrons if valence electrons < 4.
valency = 8 - valence electrons if valence electrons > 4.

Group number:

It tells how many valence electrons are present in the outermost shell of the atom.
Valence electrons = Group no. if it is equal to 1 or 2.
valence electrons = Group no. - 10 if it is more than 13 and less than 18.

Period number:

It tells how many shells are there in the atom.
No. of shells = Period no.

Explanation:

Element M belongs to group 1 and period 3.

No. of Shell = Period no. = 3
So, there will be 3 shells, K, L, and M.
Valence electrons = Group no. = 1
So, electronic configuration of element M = 2, 8, 1
The valency of the M is +1. It will form a cation M⁺.

Element 'X' belongs to group 15 and period 2.

No. of shell = Period no. = 2
So, there are 2 shells, k, and L.
Valence electrons = Group no. - 10 = 15 - 10 = 5
So, the electronic configuration of element X = 2, 5
The valency of element X = 8-5 = 3. It will form an anion X^-3.

An ionic bond will be formed between elements M and X by the transfer of one electron each from 3 atoms of M to X.

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