Question

storyline 1 exam
44 of 73
an atom of bromine has 35 electrons. these electrons are present in energy shells around the nucleus. what is the electron configuration of bromine?
o 2, 8, 18, 7
o 2, 8, 18, 35
o 2, 8, 18, 1
o 2, 8, 8, 17

Explanation:

Step1: Analyze electron shell capacity

The first shell can hold a maximum of 2 electrons, the second shell can hold a maximum of 8 electrons, the third shell can hold a maximum of 18 electrons.

Step2: Calculate remaining electrons

After filling the first three shells (2 + 8+18 = 28 electrons), for bromine with 35 electrons, the number of electrons in the fourth shell is \(35-(2 + 8+18)=7\)

Answer:

\(2,8,18,7\)