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An atom has electronic configuration 1s2 2s2 2p6 3s2 3p6 3d4 4s2, you will place it in which group?

1. Fifth
2. Second
3. Third
4. Fifteenth

Correct answer: Fifth

Solution

The given electronic configuration ends with 3d4 4s2, indicating the element belongs to the d-block. The total number of valence electrons is 6 (4 from 3d and 2 from 4s), placing it in Group 6 (or the fifth group in the modern periodic table).

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