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Question
A neutral atom of an element has a nucleus with a nuclear charge 13 times and mass 27 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 13 times and mass 27 times as that of a hydrogen nucleus. What is the ratio of electrons to protons in its stable positively charged ion?
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Solution
The correct option is B 10 : 13
Hydrogen nucleus has 1 proton (1 proton has 1 unit positive charge), which means this neutral atom has 13 units positive charge. If the mass of a hydrogen atom is 1 unit, then the mass of this neutral atom is 27 units. Since, for a neutral atom number of electrons = number of protons = 13. Now, for this neutral atom to form a stable positive ion, it must lose 3 electrons present in its valence shell to obtain stable configuration. Hence, its ion will have 10 electrons. Therefore, the ratio of electron to protons in the ion is 10:13.
Hydrogen nucleus has 1 proton (1 proton has 1 unit positive charge), which means this neutral atom has 13 units positive charge. If the mass of a hydrogen atom is 1 unit, then the mass of this neutral atom is 27 units. Since, for a neutral atom number of electrons = number of protons = 13. Now, for this neutral atom to form a stable positive ion, it must lose 3 electrons present in its valence shell to obtain stable configuration. Hence, its ion will have 10 electrons. Therefore, the ratio of electron to protons in the ion is 10:13.
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