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science Flashcards

1
Q

what is an element

A

a substance that is made of only 1 atom

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2
Q

what is a molecule

A

A group of atoms held together by chemical bond and act as a unit

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3
Q

what is the center of a atom

A

nucleus

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4
Q

what is a nucleus made of

A

protons and neutrons

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5
Q

what is the rule for making a neutral atom

A

same number of protons and electrons

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