1. Next page in journal: Notes: PNE 10/2
Essential Question What do the numbers on the periodic table tell us about mass and subatomic particles?

2. Atomic Structure 2a,e Inside the nucleus: Outside the nucleus:
Protons – positive particles (+1 charge)
Neutrons –particles with no charge ( 0 )
Outside the nucleus:
Electrons – tiny negative particles
(-1 charge)
damienkatz.net

4. 5a,d Atomic Mass atomic mass = mass of protons + neutrons
Measured in atomic mass units (amu)
1 Proton = 1 amu
1 Neutron = 1 amu
1 Electron = amu  tiny mass ~ 0
= 1 / 1840 amu
1 amu = x kg

5. 3d, 6 Counting particles Atomic # = # of Protons = # of Electrons
Atomic mass = protons + neutrons, so…
# of Neutrons = mass – protons
= mass – Atomic #

6. Reading the Periodic Table
Find Argon on your periodic table and figure out the following
Atomic # =
Atomic mass =
# Protons =
# Neutrons =
# Electrons =
xdb.lbl.gov

7. Reading the Periodic Table
Find Argon on your periodic table and figure out the following
Atomic # = 18
Atomic mass = 40
# Protons = 18
# Neutrons = 22
# Electrons = 18
xdb.lbl.gov

8. Reading the Periodic Table
Find Chlorine on your periodic table and figure out the following
Atomic # =
Atomic mass =
# Protons =
# Neutrons =
# Electrons =
research.cm.utexas.edu

9. Reading the Periodic Table
Find Chlorine on your periodic table and figure out the following
Atomic # = 17
Atomic mass = 35
# Protons = 17
# Neutrons = 18
# Electrons = 17
research.cm.utexas.edu

10. Reading the Periodic Table
If the atomic # is 47, which element is it?
Ag (Silver)
If the atomic mass is , which element is it?
Mg (Magnesium)
If there are 13 protons, which element is it?
Al (Aluminum)

11. Reading the Periodic Table
If there are 20 neutrons and 20 electrons, which element is it?
Ca (Calcium)
If there are 99 electrons, which element is it?
Es (Einsteinium)