The mass number of a nucleus is
A). Always less than its atomic number
B). Always more than its atomic number
C). Always equal to its atomic number
D). Sometimes more and somtimes equal to its atomic number
The nucleus of an atom consists of
A). Protons and Neutrons
B). Neutrons and Electrons
C). Electrons only
D). None of the above
Which of the following does the nucleus of an atom consists of?
A). Protons and neutrons
B). Protons and electrons
C). Electrons
D). Protons
Chemical properties of isotopes
A). Must be same
B). Must be different
C). Need not be same
D). Need not be different
Atoms having the same number of protons but different number of neutrons are called :
A). Isotopes
B). Cations
C). Higgs-boson
D). Anions