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Standard XII

Chemistry

Group Displacement Law

If radioactiv...

Question

If radioactive atom does one alpha and 2 beta decay, which ones of the following statements are true for this atom?
I. Its isotope is formed.
II. Its location in the periodic table does not change.
III. Its mass number decreases.

I,II are correct

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Only I is correct

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Only II is correct

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All are correct.

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Solution

The correct option is D All are correct.
If an atom does 1 alpha decay, its mass number decreases 4 and atomic number decreases 2.
If an atom does 2 beta decay, mass number of it does not change but its atomic number increases 2.
To sum up, mass number of this atom decreases 4 and atomic number does not change. Since number of protons does not change, location in the periodic table also does not change. Is mass number decreases and its isotope is formed. I, II and III are true.

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If radioactive atom does one alpha and 2 beta decay, which ones of the following statements are true for this atom?
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If radioactive atom does one alpha and 2 beta decay, which ones of the following statements are true for this atom? I. Its isotope is formed. II. Its location in the periodic table does not change. III. Its mass number decreases.

If radioactive atom does one alpha and 2 beta decay, which ones of the following statements are true for this atom?
I. Its isotope is formed.
II. Its location in the periodic table does not change.
III. Its mass number decreases.