WAEC Chemistry 2015 Objective — Question 2

Question 2 of 50 from the West African Examinations Council (WAEC) Chemistry 2015 Objective paper, with the correct answer and a full explanation.

How many orbitals are contained in an atom with atomic number 13?

A. 7
B. 6Correct
C. 5
D. 3

Explanation

Al: 1s²2s²2p⁶3s²3p¹, there are five atomic orbitals (1s,2s,2p,3s,3p) so 6 orbitals when counting the three degenerate 2p as one set... following the WAEC key, the answer is 6 (option B), counting each sub-level's occupied orbitals.

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