Question

ations and the periodic table to answer the questions: 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁵ which element is this? fluorine (f) bromine (br) chlorine (cl) krypton (kr)

Explanation:

Step1: Calculate the total number of electrons

The sum of the exponents in the electron - configuration gives the number of electrons.

$$2 + 2+6 + 2+6+2 + 10+5=35$$

Step2: Relate the number of electrons to the atomic number

In a neutral atom, the number of electrons is equal to the atomic number. So the atomic number \(Z = 35\)

Answer:

B. bromine (Br)