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Anything that occupies space and has mass

Matter

1

The functional unit of matter

Atoms

2

The core of the atom, consists of two kinds of subatomic particles

Nucleus

3

Positive charge

Proton

4

No charge

Neutron

5

99.9% of the atoms mass is found in _____

The nucleus

6

Negatively charged

Electrons

7

Electrons are found moving about the ____ at ____

1. Nucleus
2. Tremendous speeds

8

These electrons are found in _____

The electron cloud

9

The electron cloud is broken down into separate sections called ____

Shells or levels

10

Each of the surrounding levels:
1st level _____
2nd level _____
3rd level _____

1.) 2 electron max
2.) 8 electron max
3.) 8 electron max

11

Electrons near the nucleus have ____ but those away from the nucleus have ____

1. Lower energy
2. Higher energy

12

In an uncharged atom:
The number of protons = the number of ____
The charges ____ each other
The net charge on an atom is ____

Electrons
Offset
0

13

A substance that __________ into simpler kinds of matter is an element

Cannot be broken down chemically

14

Each element has a symbol, they are all represented in the ________

Periodic Table

15

The number of protons in a nucleus

Atomic number

16

The sum of the protons and neutrons in an atom vs. average of all the neutrons

Mass number/atomic weight

17

Atoms of the same element that have a different number of neutrons

Isotopes

18

Isotopes have:
The same number of _____
Different ______

Protons
Atomic mass

19

Two or more elements that are joined by CHEMICAL BONDS

Compounds

20

In compounds the proportions of the individual atoms are ____

Fixed

21

____ will always be in the same proportion for a substance

Element

22

H2O and NaCl are examples of ____

Compounds

23

Shows the proportions of atoms that form compounds

Chemical formulas

24

Shows how elements are attached

Structural formulas