Page 19 - Science Course 1 (Book 2)

Mo7-L1: Key Concept Organizer

Direction: On each line, write the term from the word bank that correctly completes each sentence. Each
term is used only once.

atoms combination composition compounds
elements matter substances

A substance is one of the two main kinds of (1.) . The (2.)

of a substance is always the same. This means that a given substance is always made up of (3.)

in the same (4.) . Aluminum, oxygen, water, and sug-

ar are examples of (5.) . There are two main kinds of substances—(6.)

and (7.) .

Mo7-L1: Key Concept Check

Direction: On the line before each statement, write the letter of the correct answer.

1. An element consists of just one type of
A. atom.
B. mixture.
C. compound.

2. Each type of atom contains a different number of protons in its
A. neutron.
B. electron.
C. nucleus.

3. The number of protons in an atom determines an element’s
A. composition.
B. atomic number.
C. chemical formula.

4. The atoms of most elements exist
A. as individual atoms.
B. in pairs.
C. in groups

Directions: Write the correct term from the word bank on the line next to what it is identifying.

atomic number name symbol

Aluminum 5.

6.
13

7.
Al

11