Question

The poor shielding of (n–2)f electrons of 6th period elements leads to.
1) decrease in size
2) increase in size
3) decrease in polarity
4) decrease in electron affinity

Answer 1

Answer:

decrease in the size

Explanation:

is the answer

Answer 2

Answer:

The poor shielding of (n-2)f electrons of 6th period elements leads to decrease in size.

Explanation:

• f-orbitals which are diffused shaped offer very less resistance against the electrostatic attraction between electrons and protons of nucleus.
• This low resistance is known as low shielding effect.
• Because of this the attraction between outermost s orbital electron and nucleus increases.
• This leads to reduced distance between them thus, decreasing the size of elements resulting in lanthanoid contraction.
• In lanthanoid contraction the strength of protons increases with increasing atomic number but the strength of electrons of f orbitals remain almost same. This leads to constant decrease of size of lanthanoid elements with increase in atomic number.

#SPJ3