An atom is called as neutral when the number of electron is equal to number of proton . Thus option C is correct.
What is neutral atom ?
Atom is the smallest unit of an element which can not be seen in with your bare eyes, due to its wavelength.
A visible light wavelength is about 0.000001 meter, where the size of an atom is 0.000000001 which is much smaller than 0.000001.
An atom has a nucleus, means it is the mass of the atom.
An atom is composed of protons, neutrons, and electrons where the protons and neutrons are combinedly form nucleus and electrons are present surrounding the nucleus.
When the number of proton and electron of an atom will be same then it is called as neutral only in normal state, but in other condition it either gain or loss electron by developing charge on it.
Neutral atoms are Oxygen, Hydrogen, Lithium, Helium etc.
Hence, option C is correct.
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