8.5 C The Periodic Table

Question 1

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

Answer 1

Periodic Table of Elements

Question 2

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

Answer 2

Element

Question 3

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

Answer 3

Chemical Symbol

Question 4

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

Answer 4

Atomic Number

Question 5

The average mass of protons and neutrons in an element.

Answer 5

Atomic Mass

Question 6

The columns on a Periodic Table that arrange the elements by the number of electrons that are in the outermost shell.

Answer 6

Groups

Question 7

The rows in a Periodic Table that classify the elements by the number of electron shells.

Answer 7

Periods

Question 8

Most elements are metals. They are typically solid, shiny, malleable, and good conductors of heat and electricity.

Answer 8

Metal

Question 9

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

Answer 9

Non-Metal

Question 10

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

Answer 10

Metalloids

Question 11

Unreactive non-metals in Group 18 of the Period Table.

Answer 11

Noble Gases

Question 12

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

Answer 12

Electron Shell

Question 13

The electrons in the outermost energy level of an atom that influence how an element will react with other substances.

Answer 13

Valence Electrons