R di h Reading the Periodic Table

What does Atomic Mass tell us?

QUESTIONQUESTION…How could you find the number of

neutrons???

Answer: Atomic mass (rounded)

Atomic #

Atomic mass (rounded)

Atomic #

# of neutrons# o o s

Lets give it a Try!

H t How many protons, electrons, and

t d N neutrons does Ne have?

10 p+

10 e-

10 010 n0

Let’s PracticeLet s Practice…

Find the number of p+ e- and n for each Find the number of p , e , and n for each element:

1. H 2. He 3. Tb

1 p+ 2 p+ 65 p+

1 e- 2 e- 65 e-1 e 2 e 65 e0 n 2 n 94 n

HOMEWORK…Find the number of p+ e- and n for each element:Find the number of p , e , and n for each element:

1 Si1. Si2. Hg3 F3. Fe4. Ta5. Pt