2. Draw a Bohr Model of Chlorine (Cl)
Atomic Number: 17
(# of protons & therefore, same # of electrons)
Atomic Mass:
(Atomic mass – Atomic number = # of neutrons)
Halogen: Group 17 (# of valence electrons)
Period 3 (# of energy levels)
Identify the ionic charge

3. Nonmetals will gain electrons when forming compounds
Nonmetals will gain electrons when forming compounds. They become negatively charged because there will be more electrons than protons. A negative ion will be formed.
17P = +17
18E= -18
17P
18N
Cl ¯ 2 8 7
ionic charge: 1E= -1

4. Draw a Dot Diagram of Chlorine
Need to know for a Dot Diagram:
Element Symbol: Cl
Group Number: 17
(# of valence electrons)
Start drawing valence electrons at the top and go counterclockwise all the way around like compass
( N  W  S  E  N)

5. Cl
Available spot for bonding!!
Cl ¯

6. Draw a Bohr Model of Sodium (Na)
Atomic Number: 11
(# of protons & therefore, same # of electrons)
Atomic Mass: 22.99
(Atomic mass – Atomic number = # of neutrons)
Alkali: Group 1 (# of valence electrons)
Period 3 (# of energy levels)
Identify the ionic charge

7. Metals will lose electrons when forming compounds
Metals will lose electrons when forming compounds. They become positively charged because there will be more protons than electrons. A positive ion is formed.
11P
12N
Na⁺
2 8 1
11P = E = -10
ionic charge: 1P = +1

8. Draw a Dot Diagram of Sodium (Na)
Need to know for a Dot Diagram:
Element Symbol: Na
Group Number: 1
(# of valence electrons)

9. Available electron for bonding!!Na
Na⁺

10. Draw a Bohr Model of Oxygen (O)
Atomic Number: 8
(# of protons & therefore, same # of electrons)
Atomic Mass:
(Atomic mass – Atomic number = # of neutrons)
Group 16 (# of valence electrons)
Period 2 (# of energy levels)
Identify the ionic charge

11. O 2- 8P 8N Atomic Number = # of protons & electrons
Atomic mass – Atomic number = # of neutrons
16 – 8 = 8 neutrons
O 2- 8P 8N 2 6

12. Draw a Dot Diagram of Oxygen (O)
Need to know for a Dot Diagram:
Element Symbol: O
Group Number: 16
(# of valence electrons)

13. O
Available spots for bonding!!
O 2-

14. Draw a Bohr Model of Beryllium (Be)
Atomic Number: 4
(# of protons & therefore, same # of electrons)
Atomic Mass: 9.012
(Atomic mass – Atomic number = # of neutrons)
Alkaline: Group 2 (# of valence electrons)
Period 2 (# of energy levels)
Identify the ionic charge

15. Be 2+ 4P 5N Atomic Number = # of protons & electrons
Atomic mass – Atomic number = # of neutrons
9 – 4 = 5 neutrons
Be 2+ 4P 5N 2 2

16. Draw a Dot Diagram of Beryllium (Be)
Need to know for a Dot Diagram:
Element Symbol: Be
Group Number: 2
(# of valence electrons)

17. Available electrons for bonding!!Be
Be 2+