Answer:
This atom has 80 protons and 98 neutrons.
Explanation:
All atoms are composed of a central nucleus in which there are positively charged particles, the protons, and neutrally charged particles, the neutrons, around which other negatively charged particles, called electrons, move.
The atomic number, identified with the letter Z, indicates the number of protons that are present in the nucleus of an atom. The atomic number defines the electronic configuration of the atom and allows the ordering of the different chemical elements in the periodic table.
If a substance has an atomic number of 80, this atom has 80 protons.
The mass number indicates the total number of particles in the nucleus, that is, the sum of protons and neutrons.
mass number = number of protons + number of neutrons
In this case you know that the mass number is 178 and number of protons is 80. Then
number of neutrons=mass number - number of protons
number of neutrons= 98
So this atom has 98 neutrons.
