Question

protons:
neutrons:
electrons:

Explanation:

Step1: Identify atomic number

The atomic number is 78, and the number of protons is equal to the atomic number. So, protons = 78.

Step2: Calculate neutrons

The atomic mass is approximately 195.08. Rounding it to 195. Neutrons = Atomic mass - Protons. So, neutrons = 195 - 78 = 117.

Step3: Determine electrons

In a neutral atom, the number of electrons is equal to the number of protons. So, electrons = 78.

Answer:

Protons: 78
Neutrons: 117
Electrons: 78