Question

Compare the following two elements, identified by their electron configurations:

A - [Kr]4d¹⁰5s²5p⁵
B - [Ar]3d⁸4s²

Which are True

A is a nonmetal and B is a noble gas.

A has the larger atomic radius.

B has the higher first ionization energy.

A forms positive ions and B forms negative ions.

Answer 1

Where A is iodine which non metal and form anion I-

Where B is Nickel which is metal and form cation Ni2+

Metals have less ionisation potential values and

Non metals have high ionisation potential values.

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B is not noble has so first option False.

B is metal so have less ionisation potential. So Third option is false.

A is non metal so form anion B is metal so form cation. Do, option 4 is also false.

The Atomic radius of A is 140 pm and B is 124 pm.

So A is larger than B.

There for True statement is

A has larger atomic radius.