Question

8
how many protons, neutrons, and electrons does xenon have?
a 54 protons, 54 neutrons, and 54 electrons
b 54 protons, 131 neutrons, and 54 electrons
c 54 protons, 54 neutrons, and 77 electrons
d 54 protons, 77 neutrons, and 54 electrons

Explanation:

Step1: Determine number of protons

The atomic number of xenon (Xe) is 54. The atomic number is equal to the number of protons. So, number of protons = 54.

Step2: Determine number of electrons

In a neutral atom, the number of electrons is equal to the number of protons. Since xenon is neutral here, number of electrons = 54.

Step3: Determine number of neutrons

The mass - number (approximate value is given as 131) is the sum of protons and neutrons. Mass number = protons+neutrons. So, neutrons = mass number - protons. Neutrons = 131 - 54 = 77.

Answer:

D. 54 protons, 77 neutrons, and 54 electrons