Question

consider the electron configuration.
which element has this electron configuration?
astatine
bromine
chlorine
fluorine

Explanation:

Step1: Count total electrons

Count the number of electrons in each orbital. 1s has 2 electrons, 2s has 2 electrons, 2p has 6 electrons, 3s has 2 electrons and 3p has 5 electrons. So, $2 + 2+6 + 2+5=17$.

Answer:

C. chlorine