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Question

Statement 1: Elements having same atomic number cannot have different mass numbers.
Statement 2: Atomic number depends on the number of neutrons.


A

Only Statement 1 is true

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B

Only Statement 2 is true

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C
Both the statements are true
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D
Both the statements are false
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Solution

The correct option is B

Only Statement 2 is true


Elements having same atomic number can have different mass numbers.

Some species have same number of protons but different number of neutrons. They are called isotopes.

Example: Isotopes of hydrogen.
H11

H21

H31

As the number of neutrons changes, the mass number (neutrons + protons) changes. But the atomic number(no.of protons) remains the same.


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