1. ELEMENTS AND THE PERIODIC TABLE
Chapter 5.5 – Day 2

2. Keep in mind that the atomic number is always lower than the atomic mass (weight)

3. ELEMENTS AND ATOMIC STRUCTURE
The Bohr-Rutherford model of the atom suggests that atoms are composed of three types of subatomic particles:
protons
neutrons
electrons

4. Bohr-Rutherford model
2, 8, 5
This is electron configuration
Bohr-Rutherford Model
Notice that the number of protons (P) and number of neutrons (N) goes in the center
Remember the dots represent electrons (E)

5. PROTONS
Are heavy positively charged particles that are found in a dense positive core of the atom called the nucleus
The number of protons in an atom is equal to the element’s atomic number

6. NEUTRONS
Are neutral particles that have about the same mass as protons and are also found in the nucleus.

7. ELECTRONS
Are negatively charged particles with almost no mass that “orbit” the nucleus at different energy levels, also called orbitals or shells.
The number of electrons in an atom equals the number of protons, therefore the atoms charge is neutral.

8. HANDOUT – 20 MINUTES
Complete the handout by reading pages
Work with a partner if you like.

9. Same as Atomic Number Same as Atomic Number
Protons Nucleus + ive
Electrons Shells - ive
Neutrons Nucleus neutral
Same as Atomic Number
Mass Number - Atomic Number
Same as Atomic Number
Neutral
Electrons
2, 8, 8

10. IONS
An ion (charged atom) in which the number of electrons is different from the number of protons.
The IONIC CHARGE is the numerical value of the electric charge with a plus or minus sign.
Give Handout to show examples.

12. HOMEWORK
QUESTIONS PAGE 187: 4,5,6abc
Ion Worksheet
Quiz tomorrow on Chapter 5.1 and 5.5