Chapter Four Flashcards

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1
Q

Element

A

A simple substance that cannot be broken down by ordinary chemical means

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2
Q

Atom

A

The smallest part of the element that still has all the properties of the element

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3
Q

Nucleus of an Atom

A

The center region of an atom that contains protons and neutrons

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4
Q

Proton

A

A positively charged particle in the nucleus of an atom

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5
Q

Electron

A

A negatively charged particle in the energy shells surrounding the nucleus of an atom

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6
Q

Energy Shells

A

The regions surrounding the nucleus of an atom where electrons may be found

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7
Q

Molecule

A

The smallest part of a compound that still has all the properties of the compound

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8
Q

Compound

A

A pure substance made of two or more elements chemically bonded together; properties of the compound are different than the properties of the elements that make it up

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9
Q

Mixture

A

A combination of two or more substances that are not chemically bonded together

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10
Q

Atomic Number

A

The numbers of protons in the nucleus of an atom

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11
Q

Group

A

The vertical columns in the Periodic Table of Elements; elements in a group have similar properties

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12
Q

Period

A

The horizontal rows in the Periodic Table of Elements

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