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 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 atoms from two or more elements.

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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 negative electrical charge and travels around the nucleus of an atom.

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8
Q

Atomic Number

A

= the number of protons in an element’s 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

Subscript

A

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

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11
Q

Chemical symbol

A

A one or two letter representation of an element.

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