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
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