which statements are true? select all that apply.
a. an atom is the smallest complete part of...
which statements are true? select all that apply.
a. an atom is the smallest complete part of an element.
b. an element is a pure substance made of one kind of atom.
c. the nucleus is the tiny center of an atom, and it contains protons and neutrons.
d. isotopes are atoms of the same element that contain the same number of neutrons but different numbers of protons.
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