1. Standard Atomic NotationF 19
Mass Number: Fluorine has a total of 19 protons and neutrons 9
Atomic Number: Fluorine has 9 protons
Therefore fluorine has 19 – 9 = 10 neutrons
Since atoms have no net charge it must have as many electrons as it does protons.

2. Activity: What does Standard Atomic Notation Tell Us?
Standard Atomic Number
Name of Element
Atomic Number
Mass Number
Number of Electrons
Number of Protons
Number of Neutrons
carbon 6 12
sulfur 16
calcium 40 20
nitrogen 7 14
molybdenum 96 42 18 C 12 6 Zn 65 30 V 51 23 In
115 49

3. Atomic and Mass Numbers
Atomic Number 9 1-
Ion charge(s) F
Symbol
Name
Fluorine
19.00
Atomic Mass
Mass Number 19
Atomic Number = the number of protons in the nucleus
Mass Number = the whole number sum of the of protons and neutrons in the nucleus
Atomic Mass = the mass of the atom weighted across its isotopes

4. Atomic and Mass NumbersH
Hydrogen 1
1.0079 1+
Atomic Number
Symbol
Name
Atomic Mass
Ion charge(s)
Mass Number
Atomic Number = the number protons in the nucleus
Mass Number = the whole number sum of the of protons and neutrons in the nucleus
Atomic Mass = the mass of the atom weighted across its isotopes

5. Representing Atoms with Diagrams
We represent atoms using Bohr-Rutherford models
What is a Bohr-Rutherford model?
What information is captured in a Bohr-Rutherford model?
15 p+
16 n0
Phosphorus atom
15 protons
16 neutrons
15 electrons

6. Representing Atoms with Diagrams
x p+
y n0
third electron orbital: can hold up to 8 electrons
inner most electron orbital:
can hold up to 2 electrons
x protons in the nucleus
y neutrons in the nucleus
second electron orbital: can hold up to 8 electrons
NOTE: # protons may = # neutrons
NOTE: # protons = # electrons

7. Representing Atoms with Diagrams
Hydrogen
Helium
Lithium
Beryllium
Boron
Carbon

8. Periodic Table of Elements1 15 16 17 18 8 9 10 11 12 13 14 2 3 4 5 6 7
Periodic Table of Elements