Warm Up

What is the difference between atomic number

and mass number?

(Write down the question and your answer)

Card Sort Directions

Place the cards under the name of the correct scientist. Don’t use your notes!

Dalton1) All matter made of tiny particles called atoms

2) All atoms of the same element are identical

3) Atoms are indivisible (can’t be broken into smaller parts)

4) Different atoms combine to make compounds

5) Atoms are rearranged during chemical changes

Thomson

Discovered Electrons

Plum Pudding Model

Rutherford Bohr

Discovered that atoms have a nucleus

Had the idea that electrons are in orbits around the nucleus

Is the mass of the water intensive or extensive?

Is the color of the water intensive or extensive?

Is the odor of the water intensive or extensive?

1

2

3

Extensive

Intensive

Intensive

Is the volume of the water intensive or extensive?

Is the conductivity of the water intensive or extensive?(conductivity is ability to conduct electricity)

4

5

Intensive

Extensive

Isotope Nucleus

Hydrogen–1

(protium)

Hydrogen-2

(deuterium)

Hydrogen-3

(tritium)

What is the difference in these isotopes of hydrogen?

6

They have different

numbers of nuetrons.

Isotopes are atoms of the same element that have different masses because they have different numbers of _____________.

7

Neutrons

Which two subatomic particles are found in the nucleus?

Mass Number is _________ + _________

8

9

Protons

+

Neutrons

Protons

and

Neutrons

Atomic Number is the number of ______ in an atom.

How many protons does neon (Ne) have?

10

11

Protons

10

Write the nuclear

notation of Neon – 22.

How many neutrons

would Neon-22 have?

13

12

Ne2210

12

Tell how many protons, neutrons and electrons this

atom would have:

F

14

169

Protons = 9

Neutrons = 7

Electrons = 9

Dalton’s Theory (Postulates)

1) All matter made of tiny particles called atoms

2) All atoms of the same element are identical

3) Atoms are indivisible (can’t be broken down into smaller parts)

4) Different atoms combine to make compounds

5) Atoms are rearranged during chemical changes

2 of Dalton’s theories were wrong. Which two are they?

15

Whose model of the atom is this?

16Whose model of the atom is this?

17

Rutherford Thomson

Whose model of the atom is this?

18

What experiment does this picture

go with?

19

Bohr

Gold

Foil

Experiment

Draw a Bohr Model of Helium-3 (use the correct numbers of protons, neutrons and electrons, and put them

all in the right place!)

20

Isotope Atomic Mass Percentage of Abundance

Boron - 10 10.01 19.9%

Boron - 11 11.01 80.1%

Silicon - 28 27.97 92.2%

Silicon - 29 28.97 4.6%

Silicon - 30 29.97 3%

Put the following into nuclear notation, and tell how many

protons, neutrons, electrons each has.

1. Atomic Number 39, mass number 89

2. Xenon – 135 (symbol is Xe)

3. An atom that has 18 protons and 22 neutrons

4. Platinum-198 (symbol is Pt)