Biology 160 | An element has an atomic number of 78.

An element has an atomic number of 78. The number of protons and electrons in a neutral atom of the element are


	A) 78 protons and 0 electrons.
	B) 78 protons and 39 electrons.
	C) 156 protons and 78 electrons.
	D) 39 protons and 39 electrons.
	E) 78 protons and 78 electrons.
	Answer: E The number of protons an element has is called the atomic number. In a neutral atom, there are the same number of protons and electrons.
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