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Science 8th > Unit 3 Periodic Table > Flashcards

Unit 3 Periodic Table Flashcards

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1
Q

A table showing the chemical elements arranged according to their atomic numbers

A

Periodic Table of Elements

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2
Q

The number of protons in the nucleus of one atom of an element

A

Atomic Number

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3
Q

The average mass of protons and neutrons in an element

A

Atomic Mass

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4
Q

The columns on a periodic table that arranges the elements by the number of electrons that are in the outside shell

A

Groups

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5
Q

The rows in a periodic table that classifies the elements by the number of atomic shells

A

Periods

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6
Q

The physical and chemical characteristics of a substance or element

A

Property

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7
Q

Most elements are metals, typically solid, shiny, malleable, and a good conductor of heat and electricity

A

Metals

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8
Q

Elements typically not shiny, usually a gas or brittle solid, not malleable, and a poor conductor of heat and electricity

A

Non-metals

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9
Q

Elements that have properties of both metals and non-metals; sometimes referred to as semiconductors

A

Metalloids

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10
Q

Un-reactive non-metals in Group 18 of the Periodic Table

A

Noble Gases

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11
Q

A specific area where electrons of the same energy level are found

A

Electron Shell

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12
Q

A pure substance that cannot be separated into simpler substances by physical or chemical means

A

Element

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13
Q

The smallest unit of an element that has all of the properties of that element containing a nucleus within an electron cloud

A

Atom

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14
Q

A positively charged subatomic particle in the nucleus of an atom and contributes to the mass of the atom

A

Proton

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15
Q

A negatively charged subatomic particle of the electron cloud; involved in the formation of chemical bonds

A

Electron

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16
Q

The tiny, very dense, positively charged region in the center of an atom; made up of protons and neutrons

A

Neutron

17
Q

Thevery dense region consisting ofprotonsandneutronsat the center of an atom

A

Nucleus

18
Q

A one- or two-letter notation used to represent an atom of a particular element

A

Atomic Symbol

19
Q

Amu stands for atomic mass unitand is used to indicatemasson an atomic or molecular scale

A

Amu unit

20
Q

The number of electronswith which a given atomgenerally bondsor number of bonds an atomforms

A

Valence Electrons

21
Q

A grouping of electrons surrounding the nucleus of an atom

A

Electron Shells

22
Q

Therateat which achemical substancetends to undergo achemical reaction

A

Reactivity

23
Q

A series of metallic elements, included in the rare-earth metals listed in in Group 3 of the Periodic Table

A

Lanthanide series

24
Q

The series includes the 15 metallic elements in Group 3 with atomic numbers 89-103. They are all radioactive and release energy when they decay. Some are synthetic, only formed in science labs.

A

Actinide series

25
Q

Elements in Periodic Table groups 1 (except hydrogen) and 2 and groups 13 to 18

A

Group A: Main Group Elements

26
Q

The 38 elements in groups 3 through 12; the transition elements are both ductile and malleable, and conduct electricity and heat

A

Group B: Transition Elements

27
Q

Metals found in Group 2 of the Periodic Table; all alkaline earth elements have an oxidation number of +2, making them very reactive. Because of their reactivity, the alkaline metals are not found free in nature.

A

Alkaline Metals

28
Q

Metals found in Group 1 of thePeriodic Table; compared to other metals they are soft and have low melting points and densities

A

Alkali Metals

29
Q

What do aluminum, silicon and phosphorous have in common?

A

All have the same amount of energy levels

30
Q

Nam three trends from left to right on the periodic table.

A

Increasing atomic number, increasing valence electrons, decreasing metallic properties

31
Q

Which particle determines reactivity?

A

Valence electrons

32
Q

Name two trends on the periodic table from top to bottom.

A

Increasing energy levels, increasing atomic number

33
Q

Which group is made of non-reactive elements?

A

Group 18, Group 8a, or Noble Gases

34
Q

Which Group is made of the most reactive metals?

A

Group 1 alkaline metals

35
Q

Elements with the most similar chemical properties are located in the same

A

Group or column

36
Q

In an atomic model how many electrons fit in the first three energy levels?

A

2-8-8

37
Q

A non reactive element has how many valence electrons in its outer shell?

A

It is full.

38
Q

The most reactive elements have how many valence electrons?

A

One or two, or need only one or two to complete its valence shell.

Science 8th (5 decks)

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