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If a substance is composed entirely of one type of atom, it is known as a(n) _______. A. isotope. B. chemical element. C. homogeneous mixture. D. neutron.
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If a substance is composed entirely of one type of atom, it is known as a(n) _______.

A. isotope.
B. chemical element.
C. homogeneous mixture.
D. neutron.

User Maelga
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A substance is composed entirely of one type of atom, it is known as a Chemical element
because mixture contain more than one type of atom and it cannot be neutron or isotope
so correct option is B
hope it helps
User Fky
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