Question

consider the electron configuration.

which element has this electron configuration?

astatine
bromine
chlorine
fluorine

Explanation:

To determine the element, we count the total number of electrons from the orbital diagrams:

• \(1s\): 2 electrons (paired).
• \(2s\): 2 electrons (paired).
• \(2p\): \(3 \times 2 = 6\) electrons (three paired orbitals).
• \(3s\): 2 electrons (paired).
• \(3p\): \(2 + 2 + 1 = 5\) electrons (two paired, one unpaired).

Total electrons: \(2 + 2 + 6 + 2 + 5 = 17\). The element with atomic number 17 is chlorine.

Answer:

chlorine (corresponding to the option "chlorine")