Question

a)write the general electronic configuration of Actinoids b) what is actinoids contraction​

Answer 1

Explanation:

General electronic lectronic configuration of actinoids :- [Rn] 5f^(1-14) 6d^(0-1)7s^2

Actinoid contraction refers to the gradual decrease in the ionic radii with increase in atomic number of actinoids.

Shielding effect of f orbital is very poor. (s>p>d>f)

5f electrons improperly shield one another. In the actinoid series, the nuclear charge and number of 5felectrons increases by one unit. But due to imperfect shielding of 5f orbitals the effective nuclear charge increases and causes contraction is size.

As the inner core electrons are strongly attracked by the nucleus hence the size decreases.

Actinoids contraction is more pronounced than lanthanoid contraction 'cause shielding effect of 5f orbital is less than shielding effect of 4f orbital.

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