1. Quietly study for your quiz – spelling counts!
Element Quiz #1
Quietly study for your quiz – spelling counts!
Make sure you write “Element Quiz #1” at the top of the paper, portrait layout, and your name & bell.
Number 1 – 11.

2. Cadmium Be Antimony Bi Arsenic Br Argon Ba Calcium B Aluminum
Element Quiz #1
Cadmium Be
Antimony Bi
Arsenic Br
Argon Ba
Calcium B
Aluminum

3. Now fill in the nuclear symbol boxes.
Draw the Helium atom in your notebook and label it using the terms to the right.
Electron
Neutron
Nucleus
Orbital
Proton
Now fill in the nuclear symbol boxes. He

4. Follow along in your text Chapter 3 Section 1 Pages 74 - 78
Atomic Theories
Follow along in your text Chapter 3 Section 1 Pages

5. Law of Definite Proportions
Every sample of a compound are made with the exact same elements in the same proportions
All salt, from a grain to all of the salt in the world is made of 60.66% Cl & 39.34% Na Na Cl

6. Law of Conservation of Mass
Mass of reactants equals the mass of the products
1 lb cheese + 1 lb tortilla chips = 2lbs of nachos O S S + O =
S O = SO2

7. Law of Multiple Proportions
Compounds always have a whole number ratio of one element to the other O N
NO has the ratio 1 N :1 O O N
NO2 has the ratio 1 N :2 O
Even though they both just have N & O

8. Dalton’s Atomic Theory
All matter is made of atoms, which can not be divided, created, or destroyed
Atoms of the same element are identical in all properties
Atoms of different elements differ in all properties

9. Dalton’s Atomic Theory
Atoms of different compounds combine in whole number ratios
Chemical Rxns combine, separate, and rearrange atoms but those atoms are never destroyed, created, or changed

10. Warm-Up
Pick the colored sticky note you want and put it on the board under the number you like best. When everyone has posted their note…
Find the percent of each number chosen.
Multiply the percent of each times each number.
Add these two answers together and then divide by 100
Does your final answer reflect an average of these two numbers? Justify.

11. Follow along in your text Chapter 3 Section 2 Pages 84 - 89
Atomic Structure
Follow along in your text
Chapter 3 Section 2
Pages

12. Parts of the Atom Electron – negatively charged particle (e-)
Located in electron cloud (orbitals)
Very small mass; doesn’t even count!
Proton – positively charged particle (p+)
Located in nucleus
Mass of 1 amu (atomic mass unit)
Neutron – neutrally charged particle (n0)
Mass of 1 amu

13. © Addison-Wesley Publishing Company, Inc.
Mass Number
mass # = protons + neutrons
always a whole number
NOT on the Periodic Table!
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14. Hyphen notation: carbon-12
Isotopes
Atoms of the same element with different mass numbers.
Nuclear symbol:
Mass #
Atomic #
Hyphen notation: carbon-12

15. Isotopes have different amounts of neutrons that change the masses!
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Neutrons 6
Neutrons 8

16. Isotopes Chlorine-37 atomic #: mass #: # of protons: # of electrons:
# of neutrons: 17 37 20

17. Ions (Charged Atoms)
Atoms of the same element with different amounts of electrons
Negative Ions (Anions) have more electrons than protons
Add the charge to the number of protons to get the number of electrons
Positive Ions (Cations) have less electrons than protons
Subtract the charge from the number of protons to get the number of electrons

18. The negative sign means it has a negative charge
Anions
The negative sign means it has a negative charge
Charge
It has 2 more electrons than protons
There are protons & 10 electrons

19. Cations
The positive sign means it has a positive charge (there is not always a plus sign)
Charge
It has 1 less electron than protons
There are protons & 18 electrons 1 39 19 K +

20. Ca 2 39 20 Ions Use the symbol to answer the below atomic #: 20
mass #:
# of protons:
# of electrons:
# of neutrons: 20 39 18 19 2 39 20 Ca

21. © Addison-Wesley Publishing Company, Inc.
Relative Atomic Mass
12C atom = × g
atomic mass unit (amu)
1 amu = 1/12 the mass of a 12C atom
1 p = amu 1 n = amu 1 e- = amu
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22. Average Atomic Mass Avg. Atomic Mass weighted average of all isotopes
on the Periodic Table
round to 2 decimal places
Avg.
Atomic
Mass

23. Average Atomic Mass
EX: Calculate the avg. atomic mass of oxygen if its abundance in nature is 99.76% 16O, 0.04% 17O, and 0.20% 18O.
Avg.
Atomic
Mass
16.00
amu

24. Average Atomic Mass
EX: Find chlorine’s average atomic mass if approximately 8 of every 10 atoms are chlorine-35 and 2 are chlorine-37.
Avg.
Atomic
Mass
35.40 amu