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An atom has three electrons in its outermost shell and the configuration of its penultimate shell is ns² np⁶ nd¹⁰. Which of the following statements about this atom is INCORRECT?

1. It is a p-block element
2. It is a 3rd period element
3. It belongs to group 13
4. It is a member of the boron family

Correct answer: It is a 3rd period element

Solution

The outermost shell has 3 electrons (ns² np¹) making it a p-block group 13 element (boron family). The fully filled d¹⁰ in the penultimate shell rules out period 3 (Al) — this describes Gallium (Ga), which is in period 4. So 'it is a 3rd period element' is incorrect.

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