Question

question 7 (1 point)
what element is represented by the electron configuration 1s2 2s2 2p6 3s2 3p6 4s1?
o a argon (ar)
o b potassium (k)
o c calcium (ca)
o d sodium (na)

Explanation:

Step1: Calculate the total number of electrons

The electron configuration is \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{1}\).
Sum the exponents: \(2 + 2+6 + 2+6 + 1=19\).

Step2: Determine the element based on atomic number

The atomic number of an element is equal to the number of electrons in a neutral atom.
Since the total number of electrons is \(19\), and the atomic number of potassium (\(K\)) is \(19\).

Answer:

B. Potassium (K)