Essential Chemistry for IGCSE - Atoms, Elements And Compounds (Section 2 - No. 8)
What is the significance of the number of protons in an atom?
It determines the size of the atom.
It determines the mass of the atom.
It determines the element's identity.
It determines the number of electrons in the nucleus.
Explanation
The number of protons defines the element's identity; if it changes, the element changes.
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