The number of protons present inside the nucleus of an atom is called atomic number.

Q. The number of protons in the nucleus of an atom is called its atomic number.

Q. Atomic number is the number of protons present in the nucleus of an atom of an element.

Q.

Consider the following statements:

1. The number of protons in the nucleus of an atom of a given element is called the atomic number of that element.

2. Mass number of an atom is defined as the sum of number of protons and neutrons present in the nucleus of an atom.

3. Atoms of an element that have the same atomic number (Z) but different mass number (A) are called isotopes.

Which of the above statements is incorrectly stated?

Q. Protons and neutron are present inside the nucleus of an atom

Q. Assertion :Isobars are the elements having same mass number but different atomic number. Reason: Neutrons and protons are present inside nucleus.