Question

how many protons, neutrons, and electrons are in krypton?
p = 36, n = 84, e = 36
p = 36, n = 48, e = 36
p = 36, n = 48, e = 84

Explanation:

Step1: Recall atomic number concept

The atomic number of krypton (Kr) is 36. The number of protons (P) is equal to the atomic number, so P = 36.

Step2: Recall mass - number and neutron relationship

The most common isotope of krypton has a mass number of 84. The number of neutrons (N) is calculated as mass number - atomic number. So N=84 - 36=48.

Step3: Recall neutral - atom electron - proton relationship

In a neutral atom, the number of electrons (E) is equal to the number of protons. So E = 36.

Answer:

P = 36, N = 48, E = 36 (the second option)