Question

Calculate the number of protons, electrons, neutrons in Bromine with atomic number 35 and mass number 80.

Answer 1

Hint: In order to answer this question you must recall the periodic properties and mole concept chapter in which you have done conversions regarding the number of moles, number of atoms, number of electrons, protons, and neutrons in a sample of given atomic number and mass number. Firstly, find the number of protons and the same number of electrons will be there and the sum of protons and neutrons form the mass number and you will get your answers.

Complete step by step answer:
Step 1: In this step we will find the number of protons of the given sample:
Number of protons of a sample = Atomic Number of the element = 35
Step 2: In this step we will find the number of electrons of the given sample:
Number of electrons of a sample = Number of protons = 35
Step 3: In this step we will find the number of neutrons of the given sample:
Number of neutrons of a sample = (Mass number - Atomic Number) of the element
Number of neutrons of a sample = 80 – 35 = 45
So, here we got our required values.
The values are:
No. of proton p = 35
No. of neutron n = 45
No. of electron e = 35

Note:The number of protons in the nucleus of the atom is equal to the atomic number (Z).The number of electrons in a neutral atom is equal to the number of protons. The mass number of the atom (M) is equal to the sum of the number of protons and neutrons in the nucleus. The number of neutrons is equal to the difference between the mass number of the atom (M) and the atomic number (Z).