atoms, elements, molecules, and compounds 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 substance. each is made of one type of atom. Carbon, mercury etc 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

subscript

A

tiny number to the right of the element symbol. Tells you how many atoms of that element

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5
Q

chemical symbol

A

a one or two letter representation of an element

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6
Q

compound

A

a substance made of atoms from two or more elements

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7
Q

proton

A

a particle of matter that has a positive electrical charge and forms part of the nucleus of an atom

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8
Q

mass number

A

numbers of protons plus neutrons. Bottom number in the element box

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9
Q

atomic number

A

number of protons. Top number in the element box

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10
Q

neutron

A

a particle of matter that has no electrical charge and forms part of the nucleus of an atom

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11
Q

electron

A

a particle of the matter that has a negative electrical charge and travels around the nucleus of an atom

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