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Question

The species that contains 24 protons, 26 neutrons and 22 electrons would be represented by the symbol:

A
50V3+
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B
26Cr2+
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C
50Cr2+
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D
26Mn2+
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Solution

The correct option is C 50Cr2+
An element can be represented as: AZXn±
Where, A is mass number of the element
Z is the atomic number
n± is the charge associated with the element
and X is the symbol of element.
From the given values,
Number of protons =24
Hence, atomic number is 24 means that the element is chromium. Symbol =Cr
Number of electrons =22
Hence, charge on element =2422=+2
Mass number =number of proton+number of neutron=24+26=50
Hence, 50Cr2+, option (c) is corect.


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