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1

Law of Conservation (of matter)

mass (or matter) is not created or destroyed in chemical reactions.The total mass of all products equals the total mass of all reactants

2

Law of Constant Composition (Law of Definite
Proportions)

compounds consist of elements combined
in definite proportions by mass.

3

Points which Dalton's Atomic Theory were wrong

1) Atoms can be divided - they consist of smaller particles
called protons, neutrons, and electrons (subatomic
particles).
2) Atoms of the same element can have different masses
(isotopes).

4

What are the 3 subatomic particles and their charges

Protons-Positive(+)
Neutrons-Neutral
Electrons-Negative(-)

5

What was the first subatomic particle discovered?

The Electron

6

Proton Mass

1.6726 x 10-24 g or 1.007 amu

7

Neutron Mass

1.6749 x 10-24 g or 1.008 amu

8

Electron Mass

9.109 x 10-28 g or 0.000549 amu

9

Equal to the number of Protons in the nucleus

Electrons

10

Like charges ___ and Unlike charges ___

Repel;Attract

11

1 amu=

1.6605387 x 10-24 g

12

An atom is electrically _____

Neutral: Protons=electrons

13

Mass Number

Protons+Neutrons= Mass Number

14

If an atom (or isotope) of oxygen contains 8
protons, 10 neutrons, and 8 electrons, what is its
1) atomic number, 2) net charge, 3) mass number?

1) 8 (Oxygen) (O)
2) Neutral
3) 18

15

Atoms of the same element that have different mass numbers

Isotopes

16

How many protons are in any zinc atom?

30

17

How many neutrons are in a zinc atom with a
mass number of 65?

35

18

What is the mass number of a different zinc
isotope that has 37 neutrons in its nucleus?

67

19

In an atomic or isotopic symbol. the mass number is the ___ and the atomic number is the ____

superscript;subscript

20

Ions are formed when

• form when atoms lose or gain electrons.
• have unequal numbers of protons and electrons.
• have a net electrical charge.

21

Groups of bonded atoms with a net
charge are called

polyatomic ions

22

Ions derived from single atoms are called

Monatomic Ions

23

Positive Ions

Cations

24

Negative Ions

Anions

25

A + in superscript on an Ion is representative of

electrons lost

26

A - in superscript on an ion is representative of

electrons gained

27

Metal ions have the same name as

the parent atom
Na-Sodium Na+ Sodium Ion

28

Atoms of nonmetals can gain electrons to reach an octet, forming

monatomic ions

29

Monatomic anions are named by taking the root of the
element name and adding

-ide
O = oxygen atom F = fluorine atom
O2− = oxide ion F− = fluoride ion
N = nitrogen atom Br = bromine atom
N3− = nitride ion Br− = bromide ion

30

Ionic compounds

• contain a combination of cations and anions in
charge balance (i.e. is neutral).
• have attractions called ionic bonds between
cations and anions.
• have high melting and boiling points.
• are solid at room temperature.