Match these items with their correct definitions. 1 . gas most pure basic substances 2 . elements combined atoms are different 3 . iupac tiny particles of elements 4 . compounds measures gravitational pull 5 . weight no fixed shape or volume 6 . mendeleev co 2 7 . atoms chemist who developed the periodic table 8 . carbon dioxide authority which assigns names to elements

➷ Gas - no fixed shape or volume

Elements - most pure basic substances

IUPAC - authority which assigns names to elements

Compounds - combined atoms are different

Weight - measures gravitational pull

Mendeleev - chemist who developed the periodic table

Carbon dioxide - CO2

Atoms - tiny particles of elements

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answer

fusion: the energy source of stars. the energy released from the collapse of the gas into a protostar causes the center of the protostar to become extremely hot. when the core is hot enough, nuclear fusion commences. fusion is the process where two hydrogen atoms combine to form a helium atom, releasing energy.

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hurricanes form in warm water