71.
All isotopes of the same element have ________

72.
The fundamental particles present in the nucleus of an atom are

73.
J.J. Thomson’s proposed model of atom is generally called ________ model.

74.
What particles move around the nucleus of an atom and are negatively charged?

75.
All isotopes of the same element have ______________

76.
Atoms having the same number of protons but different number of neutrons are called :

77.
Chemical properties of isotopes

78.
Which of the following does the nucleus of an atom consists of?

79.
The nucleus of an atom consists of

80.
The mass number of a nucleus is