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8th Science Chemistry > Ch. 3 Elements & the Periodic Table > Flashcards

Ch. 3 Elements & the Periodic Table Flashcards

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1
Q

a fast moving electron that is given off as nuclear radiation

A

Beta Particle

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2
Q

a horizontal row of elements in the periodic table

A

Period

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3
Q

a molecule made up of two atoms

A

Diatomic Molecule

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4
Q

a one or letter representation of an element

A

Chemical Symbol

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5
Q

a particle given off during radioactive decay that consists of two protons and two neutrons

A

Alpha Particle

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6
Q

a physical property of metal that is shiny and reflective

A

Luster

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7
Q

a process in which radioactive breakdown releasing fast moving particles and energy

A

Radioactive Decay

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8
Q

a reaction that involves the particles in the nucleus of an atom that can change one element to another element

A

Nuclear Reaction

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9
Q

a region of an atom in which electrons of the same energy are likely to be found

A

Energy Level

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10
Q

a small particle in the nucleus of an atom with no electrical charge

A

Neutron

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11
Q

a term used to describe a material that can be pulled out to a long wire

A

Ductile

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12
Q

an atom with the same number of protons and a different number of neutrons

A

Isotope

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13
Q

an element that has some characteristics of both metals and nonmetals

A

Metalloid

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14
Q

an element that lacks most of the properties of a metal

A

Nonmetal

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15
Q

elements in the same vertical column in the periodic table, also called family

A

Group

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16
Q

elements that are good conductors of electric current and heat

A

Metal

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17
Q

high energy electromagnetic wave with the shortest wavelength & highest frequency

A

Gamma Ray

18
Q

materials that can be hammered or rolled into flat sheets

A

Malleable

19
Q

negatively charged particles in an atom

A

Electron

20
Q

object’s ability to conduct electricity

A

Electrical Conductivity

21
Q

positively charged particles in the nucleus of an atom

A

Proton

22
Q

radioactive isotopes that can be followed through the steps of a chemical reaction or an industrial process

A

Tracer

23
Q

scientific method to determine the age of an object using the half life of one or more radioactive isotopes

A

Radioactive Dating

24
Q

small region in an atoms center, containing protons and neutrons

A

Nucleus

25
Q

substances that can conduct electric current under some conditions but not under other conditions

A

Semiconductor

26
Q

the ability of an object to transfer heat

A

Thermal Conductivity

27
Q

the arrangement of elements showing the repeating pattern of their properties

A

Periodic Table

28
Q

the average mass of all the isotopes of an atom

A

Atomic Mass

29
Q

the elements in group 18 of the periodic table, non-reactive because the valence energy level is full

A

Noble Gas

30
Q

the elements in group seventeen of the periodic table, starting with fluorine

A

Halogen

31
Q

the elements in groups three through twelve of the periodic table

A

Transition Metal

32
Q

the elements in group two of the periodic table, very reactive, hard and dense

A

Alkaline Earth Metal

33
Q

the gradual wearing away from chemical reaction

A

Corrosion

34
Q

the most reactive metals in the periodic table, all in group one

A

Alkali Metal

35
Q

the number of protons in the nucleus of an atom

A

Atomic Number

36
Q

the smallest particle that can still be considered an element

A

Atom

37
Q

the spontaneous emission of radiation by an unstable atomic nucleus

A

Radioactivity

38
Q

the sum of the protons and neutrons in an atom

A

Mass Number

39
Q

the time it takes for half the atom of a radioactive element to decay

A

Half-life

40
Q

when an element combines or reacts with other elements and compounds

A

Reactivity

8th Science Chemistry (2 decks)

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