Different elements have different kinds of atoms. How can you tell an atom of one element from an atom of another?
A. the number of electrons
B. the number of neutrons
C. the number of nuclei
D. the number of protons
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To tell an atom of one element from an atom of another, you need to consider the number of protons it has. The correct answer is D. the number of protons.
Each element on the periodic table has a unique number of protons, which is referred to as the atomic number. This number determines the identity of the element. For example, hydrogen has 1 proton, while oxygen has 8 protons. Even a slight change in the number of protons will result in a different element.
The other options mentioned - the number of electrons, neutrons, and nuclei - can vary within the same element. An atom can gain or lose electrons, resulting in an ion, and isotopes of the same element can have different numbers of neutrons. However, the number of protons remains constant for a particular element.