Question

In general, the properties that decrease and increase down a group in the periodic table respectively are:

• A. electronegativity and electron gain enthalpy.
• B. electronegativity and atomic radius.
• C. atomic radius and electronegativity.
• D. electron gain enthalpy and electronegativity.

Hint:

Electronegativity is the tendency of an atom to attract a shared pair of electrons towards itself. It decreases as we go down the group.

Answer 1

The Correct Option is B

Electronegativity decreases and atomic radius increases as we go down the group.

Hence, option B) electronegativity and atomic radius is the correct answer.

Answer 2

The summary of the variation of periodic properties is given in the table as shown below.

Thus, electronegativity decreases and atomic radius increases down a group in the periodic table.

Therefore, In general, the properties that decrease and increase down a group in the periodic table respectively are electronegativity and atomic radius.

Answer 3

Electronegativity is the tendency of an atom to attract a shared pair of electrons towards itself. It decreases as we go down the group.

• As we go down the group, the number of electron shells increases, causing an increase in atomic size and leading to a lesser attraction towards the nucleus and the outermost shell. 
• This leads to a decrease in the electronegativity of an atom.

Atomic radius is the distance between the nucleus of an atom to its outer electron shell. 

• As we go down the group, the number of electron shells increases.
• As the electron shell increases, the atomic radius also increases.

Therefore, Option (B) is correct.

As one moves down a group (vertical column) in the periodic table, the atomic number increases, resulting in an increase in the size of the atom (atomic radius). On the other hand, electronegativity decreases down a group