Direction: In the following questions, a statement of assertion (A) i...
Isotopes are species with same atomic number but different mass numbers.
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Direction: In the following questions, a statement of assertion (A) i...
Assertion: Isotopes are electrically neutral.
Reason: Isotopes are species with the same mass number but different atomic numbers.
Isotopes are electrically neutral:
- Isotopes are defined as atoms of the same element that have the same number of protons (atomic number) but different numbers of neutrons.
- Since protons have a positive charge and neutrons have no charge, the total charge of an atom is determined by the number of protons and electrons it has.
- In a neutral atom, the number of protons is equal to the number of electrons, resulting in a net charge of zero.
- Therefore, isotopes, having the same number of protons and electrons, are electrically neutral.
Isotopes have the same mass number but different atomic numbers:
- The mass number of an atom is determined by the sum of its protons and neutrons.
- Isotopes of an element have the same number of protons (same atomic number) but different numbers of neutrons, leading to different mass numbers.
- For example, carbon-12 and carbon-14 are isotopes of carbon. Carbon-12 has 6 protons and 6 neutrons, while carbon-14 has 6 protons and 8 neutrons.
- Despite having different mass numbers, both isotopes are electrically neutral because the number of protons and electrons remains the same.
Conclusion:
The assertion is true that isotopes are electrically neutral because they have the same number of protons and electrons. However, the reason provided is false because it incorrectly states that isotopes have the same mass number but different atomic numbers. The correct statement should be that isotopes have the same atomic number but different mass numbers. Therefore, the correct answer is option C, where the assertion is true but the reason is false.
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