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Standard VIII

Chemistry

Ions

A neutral ato...

Question

A neutral atom of an element has a nucleus with a nuclear charge 11 times and mass 23 times as that of a hydrogen nucleus. What is the ratio of electrons to protons in its stable positively charged ion?

23 : 11

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10 : 11

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20 : 21

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10 : 12

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Solution

The correct option is B 10 : 11
The hydrogen nucleus has 1 proton (1 proton has 1 unit positive charge), which means this neutral atom has 11 units positive charge. If the mass of a hydrogen atom is 1 unit, then the mass of this neutral atom is 23 units. Since, for a neutral atom number of electrons = number of protons = 11. Now, for this neutral atom to form a stable positive ion, it must lose one electron present in its valence shell to obtain a stable configuration. Hence, its ion will have 10 electrons. Therefore, the ratio of electrons to protons in the ion is 10:11.

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A neutral atom of an element has a nucleus with a nuclear charge 11 times and mass 23 times as that of a hydrogen nucleus. What is the ratio of electrons to protons in its stable positively charged ion?​

A neutral atom of an element has a nucleus with a nuclear charge 11 times and mass 23 times as that of a hydrogen nucleus. What is the ratio of electrons to protons in its stable positively charged ion?