Question

Atomic size of 3d series elements from Cr to Cu is almost same. Give reason.

Answer 1

Answer:

The atomic size of transition element are relatively the same...., because... although the number of protons in the nucleus increase, the additional electrons are added to the 3d subshell. The electrons in the 3d subshell contributes to shielding effect and this results in a relatively constant effective nuclear charge.

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Answer 2

Answer:

Increased effective nuclear charge is balanced by decreased screening effect of (n-1)d or bitals.