Unit 3 Periodic Table

Question 1

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

Answer 1

Periodic Table of Elements

Question 2

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

Answer 2

Atomic Number

Question 3

The average mass of protons and neutrons in an element

Answer 3

Atomic Mass

Question 4

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

Answer 4

Groups

Question 5

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

Answer 5

Periods

Question 6

The physical and chemical characteristics of a substance or element

Answer 6

Property

Question 7

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

Answer 7

Metals

Question 8

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

Answer 8

Non-metals

Question 9

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

Answer 9

Metalloids

Question 10

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

Answer 10

Noble Gases

Question 11

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

Answer 11

Electron Shell

Question 12

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

Answer 12

Element

Question 13

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

Answer 13

Atom

Question 14

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

Answer 14

Proton

Question 15

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

Answer 15

Electron

Question 16

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

Answer 16

Neutron

Question 17

Thevery dense region consisting ofprotonsandneutronsat the center of an atom

Answer 17

Nucleus

Question 18

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

Answer 18

Atomic Symbol

Question 19

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

Answer 19

Amu unit

Question 20

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

Answer 20

Valence Electrons

Question 21

A grouping of electrons surrounding the nucleus of an atom

Answer 21

Electron Shells

Question 22

Therateat which achemical substancetends to undergo achemical reaction

Answer 22

Reactivity

Question 23

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

Answer 23

Lanthanide series

Question 24

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.

Answer 24

Actinide series

Question 25

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

Answer 25

Group A: Main Group Elements

Question 26

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

Answer 26

Group B: Transition Elements

Question 27

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.

Answer 27

Alkaline Metals

Question 28

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

Answer 28

Alkali Metals

Question 29

What do aluminum, silicon and phosphorous have in common?

Answer 29

All have the same amount of energy levels

Question 30

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

Answer 30

Increasing atomic number, increasing valence electrons, decreasing metallic properties

Question 31

Which particle determines reactivity?

Answer 31

Valence electrons

Question 32

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

Answer 32

Increasing energy levels, increasing atomic number

Question 33

Which group is made of non-reactive elements?

Answer 33

Group 18, Group 8a, or Noble Gases

Question 34

Which Group is made of the most reactive metals?

Answer 34

Group 1 alkaline metals

Question 35

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

Answer 35

Group or column

Question 36

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

Answer 36

2-8-8

Question 37

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

Answer 37

It is full.

Question 38

The most reactive elements have how many valence electrons?

Answer 38

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