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Question
Compare an electron, a proton and a neutron in respect of their relative masses and charges.
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Solution
Relative masses :relative mass of a neutron is 1u, that of a proton is also 1u and that of an electron is (1/1840) u.
Charge: Charge of a proton is +1, that of an electron is –1 and that of a neutron is zero.
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number of valence electrons present in magnesium is
Tick the most appropriate answer.
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ANSWER IN DETAIL
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