1. Periodic Table

2. Review
Mass Number
The atomic number tells you the number of __________________ in an atom.
The mass number tells you the number of ___________________ and ____________________.
Atomic Number

3. Draw a Bohr-Rutherford model and SAM model for
Bohr-Rutherford (ST) SAM (EST) 2 e- 8 e- (does not acknowledge neutrons) (acknowledges neutrons) Ne
10 p+
10 p+
10 n0

4. is not the only type of neon… There’s also:

5. These different variations of neon are called isotopes of neon
These different variations of neon are called isotopes of neon. They are atoms of the same element with DIFFERENT numbers of neutrons.
Isotopes

6. Which isotope of neon is the most common?
Isotopes of Neon

7. Periodic Table of Isotopes

8. Draw SAM models for the first 20 elements of the Periodic Table according to page 2 of your new workbook.
The isotope shown in your workbook is the most abundant of element in nature.
Include the atomic number, symbol, and its name.
Answer the questions on page 2.
Your job

9. What’s trending? #periodictable

10. What’s trending? #periodictable
Rows in the periodic table are called ____________. What do all elements in the same row have in common? Columns in the table are called _____________. With one exception, what do all elements located in the same column have in common? What is the exception?
What’s trending? #periodictable

11. Figuring out atomic mass
The unit for atomic mass, which is written at the bottom of each Periodic table entry is called the atomic mass unit (amu).
1 amu = 1.66 x g
Protons and neutrons each have a mass of nearly exactly 1 amu.
Figuring out atomic mass

12. Isotopes of chlorine

13. Isotopes of chlorine
We need to take the average atomic mass of the two isotopes to determine the actual atomic mass.
Is it 36?

14. You need to know their relative abundances in nature.
76% %
You need to know their relative abundances in nature.

15. Challenging question…
There are two stable isotopes of copper % of copper contains 34 neutrons in the nucleus. The remaining copper atoms have a mass number of 65.
Fill in this table for Copper (Cu)
Atomic # # of neutrons Mass number Abundance 65
Challenging question…