Explanation:
An atom is made up of three fundamental subatomic particles which are;
Protons are the positively charged particles in an atom
Neutrons carry no charges
Electrons are negatively charge.
An ion is formed when an atom loses or gains electrons. In an ion, the number of protons and electrons differs.
For an atom that is neutral, number of protons is equal to the number of electrons.
Given date;
Number of protons = 26
Number of electrons = 25
Number of neutrons = 28
From this data, we see that the number of protons is more than that of the electrons:
Charge = number of protons - number of electrons = 26 - 25 = +1
The atom is an ion with a charge of +1, i.e it has lost an electron.
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