Tnhs 7 Science Ch.3 Review

Front 1

What is an element's atomic mass?

Back 1

Average mass of the different forms of that element's atoms

Front 2

How did Moseley change the arrangement of the elements on his periodic chart?

Back 2

He rearranged the elements by atomic number

Front 3

What is the basis for the periodic table?

Back 3

The Periodic Law

Front 4

What is the Periodic Law?

Back 4

the repeating chemical and phiscial properties of elements relate to and depend on the elements' atomic numbers

Front 5

When did Mendeleev discover a pattern to the elements?

Back 5

1869

Front 6

What was the pattern that Mendeleev discovered about elements?

Back 6

Similar physical and chemical peroperties repeated in evert eighth element. There was a repeating pattern

Front 7

How many groups did Mendeleev use to group the elements?

Back 7

7 groups because every eighth element had similar properties

Front 8

What is the smallest unit of mnass into which an element can be divided and still retain its properties?

Back 8

An Atom

Front 9

What does every atom contain?

Back 9

A nucleus surrounded by one or more electrons

Front 10

What type of charge do electrons have?

Back 10

negative charge

Front 11

What is an atom's nucleus usually made of?

Back 11

Protons and Neutrons

Front 12

What type of charge do protons have?

Back 12

positive charge

Front 13

What type of charge do neutrons have?

Back 13

Neutral charge

Front 14

T or F
A single proton or neutron has almost 200 times the mass of an electron?

Back 14

False
2,000 times the mass of an electron

Front 15

What is the atomic number of an element?

Back 15

The number of protons in an atom's nucleus

Front 16

What color do elements that are metals have as a background color?

Back 16

blue

Front 17

Which elements have a yellow background on their box on the periodic table?

Back 17

gases

Front 18

Which elements have green backgrounds on the periodic table?

Back 18

Metalloids

Front 19

T or F
The chemical symbols used on all periodic tables are used by scientists throughout the world.

Back 19

True

Front 20

List the items found in each box on the periodic table:

Back 20

1. element's name
2. chemical symbol
3. atomic number
4. atomic mass

Front 21

How; many letters are found in a chemical's chemical symbol?

Back 21

one or two; 1 or 2

Front 22

What is the name for the group of chemcials on the periodic chart that are in each horizontal row?

Back 22

A period

Front 23

Why is a row on the periodic table called a period?

Back 23

The properties of elements in a row frollow a repeating or periodic pattern

Front 24

What is the name for the elements located in a column on the periodic table?

Back 24

Group

Front 25

What is a group of elements also called?

Back 25

A family

Front 26

What type of element is the majority of elements?

Back 26

Metals

Front 27

Where are metals found on the periodic table?

Back 27

To the left of the zig-zag line

Front 28

What type of property is an element's state?

Back 28

Physical property

Front 29

Most metals are in what type of state at room temperature?

Back 29

solid

Front 30

What type of state is Mercury found in at room temperature?

Back 30

liquid

Front 31

What are solutions of metals are called?

Back 31

alloys

Front 32

T or F
Metals on the left side of the periodic table are not very reactive with oxygen.

Back 32

False. They are very reactive with oxygen.

Front 33

T or F
Metals near the zigzag line are much less reactive with oxygen.

Back 33

True

Front 34

What do many metals produce when they are combined with acids?

Back 34

Salt and a hydrogen gas.

Front 35

What is the common name for the reaction of Iron and Oxygen?

Back 35

Rust

Front 36

What are elements that have properties of both metals and nonmetals?

Back 36

Metalloids

Front 37

Where are metalloids located on the periodic table?

Back 37

They border the zigzag line.

Front 38

Who developed the first periodic table, Mendeleev or Moseley

Back 38

Mendeleev

Front 39

T or F
Properties of elements repeat in a regular pattern.

Back 39

True

Front 40

Who arranged the elements on a periodic table in increasing atomic numbers?

Back 40

Moseley

Front 41

T or F
Each element has a a chemical symbol that is recognized around the world./

Back 41

True

Front 42

T or F
Physcial and chemical properties of elements change across each period.

Back 42

True

Front 43

T or F
Elements in a group usually have similar properties.

Back 43

True

Front 44

T or F
Most metals do not combine easily with other elements to form compounds and alloys.

Back 44

False. They combine easily.

Front 45

T or F
Most nonmetals are gas at room temperature.

Back 45

True

Front 46

List the 3 nonmetals that are very important to living things:

Back 46

Oxygen
Carbon
Nitrogen

Front 47

What is the metalloid used to make computer chips?

Back 47

Silicon