Chemistry Subatomic Particles Solution: Which ion has twenty-eight electrons?A. Cr2+B.Fe2+...

Solution: Which ion has twenty-eight electrons?A. Cr2+B.Fe2+C. Ni2+D. Zn2+

Problem

Which ion has twenty-eight electrons?

A. Cr2+

B.Fe2+

C. Ni2+

D. Zn2+

Solution

We’re being asked which among the given ions has twenty-eight (28) electrons.


An element can be represented as:


You can determine the identity of the element using its atomic number:

Atomic number (Z): 

represents the identity of the element
reveals the number of protons
in a neutral element:

            # of protons = # of electrons

Mass number (A)

reveals the number of protons and neutrons

            mass number = # of protons + # of neutrons


Given:           # of electrons = 28 e-

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