Which statement about the nuclei in atoms of an element is correct?
- AEvery nucleus of an element contains an equal number of neutrons and protons.
- BEvery nucleus of an element contains the same number of neutrons as all others of that element, but the number of protons may differ.
- CEvery nucleus of an element contains the same number of protons as all others of that element, but the number of neutrons may differ.
- DThe number of protons in a nucleus differs from isotope to isotope of an element, as do the number of neutrons.