atom elements Flashcards

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1
Q

atom

A

the smallest particle of an element that can exist

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2
Q

element

A

a pure chemical substance that cannot be physically split into a more simple subsistence. each is made of one type of atom. carbon mercury and hydrogen are examples.

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3
Q

molecule

A

the smallest particle of a substance that can exist. it is composed of two or more atoms

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4
Q

compound

A

a substance made of two or more eliments

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5
Q

proton

A

a particle of matter that has a positive electrical charge and found in the nucleus of an atom

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6
Q

neutron

A

a particle of matter that has no electrical charge and found in the nucleus of an atom

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7
Q

electron

A

a particle of matter that has a negitive electical charge and travels around the nucleus of an atom

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8
Q

atomic number

A

= the number of protons in an elements atoms top number in the element box.

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9
Q

mass number

A

number of protons plus neutrons. bottom number in the element box.

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10
Q

chemical symbol

A

a one or two letter representation of an element

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