MCAT General Chemistry Question 3: Answer and Explanation

Home > MCAT Test > MCAT general chemistry practice tests

Test Information

Use your browser's back button to return to your test results.
Do more MCAT general chemistry practice tests.

Question: 3

3. What is the maximum number of electrons allowed in a single atomic energy level in terms of the principal quantum number n?

A. 2n
B. 2n + 2
C. 2n²
D. 2n² + 2

Correct Answer: C

Explanation:

For any value of n there will be a maximum of 2n² electrons; that is, two per orbital. This can also be determined from the Periodic Table. There are only two elements (H and He) that have valence electrons in the n = 1 shell. Eight elements (Li to Ne) have valence electrons in the n = 2 shell. This is the only equation that matches this pattern.

Previous Next