Question

How many protons are present in an atom which has an atomic number of 35?

Answer 1

Hint: A subatomic particle which has a positive electric charge of +1 is known as a proton. There are at least one proton present in the nucleus of each atom and hence are a necessary part of the nucleus. They also are the defining property of an element.

Complete answer:
The atomic number Z of an element can be defined as the number of protons which are present in the nucleus of every atom of that element. It is also known as the proton number.
Every element has a unique and different number of protons present, and hence every element has a unique atomic number.
Now, we know that the atom which has an atomic number of 35 is Bromine (Br).
Since the number of protons present in an atom is equal to the atomic number, there are 35 protons present in the bromine atom.

Additional Information:
- Protons and electrons have equal and opposite charge.
- The mass of the proton is slightly less than the mass of a neutron.
- Nucleons are the particles which are present in an atomic nuclei and contain protons and neutrons.
- The number of neutrons in an atom is equal to the difference between the mass number and the atomic number of the atom.

Note:
If there is no charge whatsoever present on an element, the number of electrons present in an atom is also equal to the atomic number, making the number of protons equal to the number of electrons.