GK
NUCLEAR SCIENCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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They have the same atomic number but different mass numbers
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They have the same number of neutrons but different mass numbers.
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They have the same number of neutrons but different modes of radioactive decay.
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The sum of the number of protons and neutrons is the same, but the number of protons is different.
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Detailed explanation-1: -Two atoms with the same atomic number, but different mass numbers (same number of protons, different number of neutrons), are called isotopes, or isotopic nuclides. Having different numbers of neutrons changes the mass of these atoms, so isotopes have slight variations in their physical and chemical behavior.
Detailed explanation-2: -Different isotopes of an element have the same number of protons in the nucleus, giving them the same atomic number, but a different number of neutrons giving each elemental isotope a different atomic weight.
Detailed explanation-3: -Isotopes are atoms with different atomic masses which have the same atomic number. The atoms of different isotopes are atoms of the same chemical element; they differ in the number of neutrons in the nucleus.
Detailed explanation-4: -NO. If two atoms have the same mass number, they could be identical atoms with the same atomic number and mass number. In this case they would not be isotopes of each other they would be the same isotope.
Detailed explanation-5: -Reason: Isotopes are the atoms of the same element having a same atomic number but different mass numbers.