SCIENCE
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Protons are positively charged particles which contribute to the weight of an atom.
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The overall charge of the atom’s nucleus is always positive.
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The number of electrons always equals the number of protons in a neutral atom.
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The bigger difference in neutrons in the isotope, the more stable it becomes.
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Detailed explanation-1: -Solution : They have different mass numbers.
Detailed explanation-2: -Explanation: Statement 1 is incorrect: Isotopes are those elements having the same atomic number and different mass number. In isotopes the atoms have different numbers of neutrons but the number of protons remains the same.
Detailed explanation-3: -An even number of protons or neutrons is more stable (higher binding energy) because of pairing effects, so even–even nuclides are much more stable than odd–odd.
Detailed explanation-4: -Having too many or too few neutrons relative to protons results in an unstable, or radioactive, nucleus that will sooner or later break down to a more stable form. This process is called radioactive decay. Many isotopes have radioactive nuclei, and these isotopes are referred to as radioisotopes.