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The Periodic Table
Chapter 15 Vocabulary; elements, groups and metals.
31
Chemistry
8th Grade
04/22/2009

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Cards

Term
By 18__, chemists had isolated and named __ different elements.
Definition

30


55

Term

Mendeleev left _____ gaps on the periodic table, because these elements had been discovered yet:

1.) _ _ _ _ _ _ _

2.) _ _ _ _ _ _ _ _

3.) _ _ _ _ _ _ _ _ _

Definition

three


1.) gallium


2.) scandium


3.) germanium

Term
How did Henry Moseley improve Mendeleev's periodic table?
Definition
He arranged the elements in order of atomic number rather than atomic mass. This made it clear how many elements were still undiscovered.
Term
Rows on the periodic table are labeled _ - _.
Definition
1 - 7
Term

Vocabulary:


period

Definition
Period- row of elements in the periodic table whose properties change gradually and predictably.
Term

Vocabulary:

 

group

Definition
Each groups contains elements that have similar physical or chemical properties (columns).
Term

Vocabulary:


representative elements

Definition

 Eight groups that include metals, metalloids and nonmetals.


This section includes groups 1 & 2, 13-18.

Term

Vocabulary:


transition elements

Definition
Elements in groups 3-12 that are all metals.
Term

Vocabulary:


metal

Definition

An element that

 

- has luster

- is a good conductor of heat & electricity

- is malleable

- is ductile

Term

Vocabulary:


nonmetals

Definition
Gases or brittle solids at room temperature that are poor conductors of heat and electricity.
Term

Vocabulary:


metalloid

Definition
An element that shares some properties with metals, and some with nonmetals.
Term
How are alkali metals different from alkaline earth metals?
Definition
Alkali metals are silvery solids with low densities and melting points, while alkaline earth metals are denser and harder, and have higher melting points than alkali metals in their same period.
Term

Vocabulary:


semiconductor

Definition

Doesn't conduct electricity as well as a metal, but does conduct electricity better than a nonmetal.


Think of silicon in computer chips.

Term

Vocabulary:


halogens

Definition
Group 17's family name, which means "salt formers."
Term
In what way did Dmitri Mendeleev contribute to the periodic table?
Definition
He arranged the first official periodic table in 1869. He arranged the elements in order of increasing atomic mass.
Term

Vocabulary:


luster

Definition
the ability to reflect light
Term
What group are the alkali metals in, and what are some of their characteristics?
Definition

Group 1

Alkali metals are silvery solids with low densities and melting points.

Term
What group are the alkaline earth metals in, and what are some of their characteristics?
Definition

Group 2

They are denser, harder and have higher melting points than alkali metals in the same period.

Term
Groups 3-12 are _ _ _ _ _ _ _ _ _ _ metals.
Definition
transition
Term
Describe Group 13.
Definition
Group 13 is the Boron family, which are all metals- except for boron, which is a metalloid.
Term
Describe Group 14.
Definition
Group 14 is the Carbon Group, which contains a nonmetal, two metalloids and two metals.
Term
Describe Group 15.
Definition
Group 15 is the Nitrogen Group, and it has all metal-groups covered, just like Group 14.
Term
Group 16 is the _ _ _ _ _ _ Family. It has _ _ _ _ _ nonmetals, and _ _ _ metals.
Definition

Oxygen

three

two

Term
What does the word "halogens" mean?
Definition
"salt-formers"
Term
Group 17 is the _ _ _ _ _ _ _ Group. They are all nonmetals, except for _ _ _ _ _ _ _ _, which is a radioactive _ _ _ _ _ _ _ _ _.
Definition

Halogen

astatine

metalloid

Term
Describe Group 18.
Definition
Group 18 is the Noble Gases, all six are nonmetals and have low reactivity. They rarely combine with other elements.
Term

Vocabulary:


catalyst

Definition
a substance that can make something happen faster but is not changed itself.
Term
What elements are in the Iron Triad?
Definition

Iron, Cobalt and Nickel.

They have very similar properties.

Term

Vocabulary:


lanthanide series

Definition
First series of inner transition elements which ranges from cerium to lutetium.
Term

Vocabulary:


actinide series

Definition
Second series of inner transition elements that ranges from thorium to lawrencium.
Term

Vocabulary:


synthetic elements

Definition
Elements made in laboratories; do not exist naturally.
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