Atoms, Elements, Molecules, and Compounds

Question 1

anything that has mass and takes up space

Answer 1

matter

Question 2

the smallest part of a substance that has all the properties of a substance

Answer 2

atom

Question 3

a positive charged particle found in the nucleus of an atom. It tells what type of atom it is.

Answer 3

proton

Question 4

a particle in the nucleus of an atom with no charge; it is neutral

Answer 4

neutron

Question 5

a negative charged particle found in the “shell” or “cloud” orbiting the nucleus

Answer 5

electron

Question 6

a pure substance made up of only one type of atom

Answer 6

element

Question 7

a table in which elements are arranged in order of the number of protons each atom contains

Answer 7

periodic table

Question 8

a group of atoms joined together, it may be made up of atoms of one or more different elements

Answer 8

molecule

Question 9

a substance whose molecules contain atoms of different elements

Answer 9

compound

Question 10

the center of an atom which is made up of two smaller parts

Answer 10

nucleus

Question 11

a short way of writing an element’s name

Answer 11

symbol

Question 12

Does an element’s symbol always begin with a capital letter?

Answer 12

yes

Question 13

the number of protons in one atom of an element.

Answer 13

atomic number

Question 14

In the Periodic Table, are elements written in order of their atomic number?

Answer 14

yes

Question 15

How many atoms are in one molecule of CO2

Answer 15

3

Question 16

How many atoms are in one molecule of C4H12O4?

Answer 16

20

Question 17

Name the three basic particles that make up an atom.

Answer 17

protons, electrons, and neutrons

Question 18

Where is the nucleus located?

Answer 18

at the center of an atom

Question 19

The number of neutrons affects the ___________and the radioactivity of the atom.

Answer 19

mass

Question 20

When two atoms join together, they make a ____________________________

Answer 20

molecule

Question 21

When atoms of different types of elements join together, they make molecules called ________________________.

Answer 21

compounds

Question 22

Molecules and compounds are held together by forces called chemical _____________.

Answer 22

bonds

Question 23

molecules are made up of more than one________________________

Answer 23

atom

Question 24

Compounds are molecules that are made up of more than one _______

Answer 24

element

Question 25

What is the common name for the compound H2O?

Answer 25

water

Question 26

Bonds between atoms are generally formed by what particles?

Answer 26

electrons

Question 27

What is the most common element in the human body?

Answer 27

carbon

Question 28

An ______________ is the smallest particle of a substance that has all the
properties of the substance. It can be divided into _______________parts.

Answer 28

atom, smaller

Question 29

The number of ______________ determines how the atom behaves.

Answer 29

electrons

Question 30

Each element has a chemical __________, which is a short way of writing the element’s name.

Answer 30

symbol

Question 31

Atoms join together to form ____________.

Answer 31

molecules

Question 32

A compound is a substance whose molecules contain atoms of
______________ elements.

Answer 32

different