Question

an element’s identity is determined by the number of
valence.
electrons.
neutrons.
protons.

Explanation:

The number of protons in an atom's nucleus defines the element. Each element has a unique number of protons, known as its atomic number. Valence refers to an atom's ability to combine with other atoms. Electrons are involved in chemical bonding but do not determine element identity. Neutrons affect the mass and stability of an isotope but not the element's identity.

Answer:

D. protons