The correct answer is: Atoms are the building blocks that make up elements. At the center of each atom is a nucleus composed of small particles called protons and neutrons. Nuclei is the plural of nucleus; option C.
<h3>What is atomic number of an element?</h3>
The atomic number of an element is the number of protons present in the nucleus of the atom of the element.
The nucleus is the center of the atom and is the heaviest part of the atom.
Another sub-atomic particle fund in the nucleus is the neutron.
Elements are named according to the number of protons in the nuclei.. This is because the number of protons in the nucleus of any given atom whereas the neutron number may vary, Also, electrons are easily removed from atoms of elements.
In conclusion, the number of protos in atom is used to name the atom.
Learn more about atomic number at: brainly.com/question/487717
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