Atoms having the same ________ but different _____ are called isotopes.

Q.

Nuclei with the same number of protons but a different number of neutrons are called isobars

Nuclei with the same number of neutrons but a different atomic number are called isotopes

Nuclei with the same mass number are called isotones

Q. Atoms having the same atomic number but a different mass number are called ___.

Q. Isotopes of an element have the same atomic number but a different ________.

Q. Assertion :The mass spectrometer is used for determination of the atomic mass of isotopes.
Reason: Isotopes are the atoms of the same element having a same atomic number but different mass numbers.

Q. The ratio of the mass of ${}^{12}C$ atom to that of an atom of element= X (whose atomicity is four) is 1:9. The molecular mass element X is: