Question

12, Select the correct statement(s).
(a) Across a transition series, there is only a small
decrease in atomic radius from one element to
another due to very small increase in effective
nuclear charge.
(b) The rate of decrease in the size across the
lanthanide series is less than the across the first
transition series.
(c) Both (a) and (b) are correct statements
(d) None of the above statement is correct
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Answer 1

Answer:

b)

Explanation:

the rate of decrease in the size across the lanthanide series is less than the Cross the first transition series

Answer 2

Answer:

(a)

Explanation:

a) There is an addition of protons, making the electrostatic force due to attraction very high hence resulting in a decrease in atomic radius or size.

b) the rate of change is higher in the lanthanides series because there are many more protons compared to the transition metals and weight of an electron is negligible.