Question

question 7
54
xe
xenón
131.29
xenon has
protons
neutrons
electrons

Explanation:

Step1: Recall atomic number property

The atomic number is equal to the number of protons. For Xe, atomic number is 54, so number of protons = 54.

Step2: Recall mass - number and neutron - proton relation

The average atomic mass of Xe is approximately 131.29. Rounding to 131. Mass number = protons + neutrons. So neutrons = mass number - protons = 131 - 54 = 77.

Step3: Recall charge - neutral atom property

In a neutral atom, number of electrons = number of protons. So number of electrons = 54.

Answer:

Protons: 54
Neutrons: 77
Electrons: 54