Question

1. an element has an electron configuration of (1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{7}4s^{2}). how many electrons does an atom of this element have?

a. 18
b. 24
c. 27
d. 71

Explanation:

Step1: Sum the exponents

The electron configuration is \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{7}4s^{2}\). Sum the exponents: \(2 + 2+6 + 2+6 + 7+2\).

Step2: Calculate the sum

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Answer:

C. 27