chapter 3 Flashcards

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1
Q

Element

A

A material that cannot be separated into multiple materials

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2
Q

Atom

A

The smallest particle of an element

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3
Q

Nucleus

A

Made up of protons and neutrons, found in the center of an atom

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4
Q

Proton

A

A particle that has a positive electrical charge

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5
Q

Neutron

A

A particle with no electrical charge

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6
Q

Atomic number

A

The number of protons in an atom’s nucleus

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7
Q

Mass number

A

The combined number of protons and neutrons in the nucleus

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8
Q

Electron

A

A particle that orbits the atom’s nucleus and has a negative electrical charge

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9
Q

Energy level

A

The area in the atom where an electron is most likely to be found

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10
Q

Valence electrons

A

Elections that are in the outermost energy level that determine the chemical behavior of different elements

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11
Q

Isotopes

A

Atoms of an element that have differing numbers of neutrons

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12
Q

Atomic mass

A

The average of the mass numbers of isotopes of an element

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13
Q

Radioactivity

A

The spontaneous process when unstable nuclei emit radiation

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14
Q

Compound

A

Something that is made up of two or more elements

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15
Q

Chemical bonds

A

The forces that hold elements together in compounds

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16
Q

Covalent bond

A

When two atoms share electrons to gain electrons

17
Q

Molecule

A

Two or more atoms held together by sharing electrons

18
Q

Ion

A

An atom that gains or loses an electron

19
Q

Ionic bond

A

The force between two ions of opposite charge

20
Q

Chemical reaction

A

A change of a substance into another substance

21
Q

Solution

A

A mixture in which the contents are indistinguishable

22
Q

Acid

A

A solution with a pH of less than 7 and produces H+

23
Q

Base

A

A solution with a pH of over 7 and produces OH-

24
Q

Crystalline structure

A

A structure in a solid where the particles are arranged in geometric patterns

25
Q

Glasses

A

Solids with atoms that are close together and have no pattern

26
Q

Evaporation

A

A process in which a liquid turns into a gas

27
Q

Sublimation

A

A process in which a solid turns into a gas without becoming a liquid first

28
Q

Plasmas

A

A gas that has been heated to an extremely high temperature where electrons are separated from atoms

29
Q

Condensation

A

A process in which gas changes into a liquid

30
Q

Mineral

A

A naturally occurring substance with a crystalline structure

31
Q

Crystal

A

A solid that has a repeating pattern of atoms