Types of Chemical Reaction

1. Science Class
Week 6

3. Element
Atomic
Number
Atomic
Mass
Proton Neutrons Electrons
Ca 20 40 20 20 20
Fe 26 56 26 30 26
U 92 232 92 140 92

5. Determine the number of protons, neutrons,
and electrons in a particular atom.
(S8MT-IIIe-f-10)
Objectives

6. What’s your prior
knowledge?
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8. Sodium
Protons : 11
Electrons: 11
Neutrons: 12
Chlorine
Protons : 17
Electrons: 17
Neutrons: 18
Sodium
Protons : 11
Electrons: 10
Neutrons: 12
Chlorine
Protons : 17
Electrons: 18
Neutrons: 18
Na+1
Cl-1

9. A neutral atom has the same number of protons and
electrons.
ATOM
A charged atom
ION

10. Positively charged ion
CATION
More protons than electrons
Loss of electrons
K
39
19
+1
p+ = 19
e- = 18
n0 = 20

11. Negatively charged ion
ANION
More electrons than protons
Gain of electrons
P
31
15
-3
p+ = 15
e- = 18
n0 = 16

12. Element
Atomic
Number
Atomic
Mass
Charge Proton Neutrons Electrons
S 16 32 -2 16 16
Li 3 7 +1 3 4
H 1 1 -1 1 0
18
2
2

13. Isotopes
Atoms with the same number of protons but
different number of neutrons

15. Element
Atomic
Number
Atomic
Mass
Proton Neutrons Electrons
H 1 1 1 0
H 1 2 1 1
H 1 3 1 2
1
1
1

17. THINGS TO DO
Looking Back
Activity 1
Activity 2
Activity 3
Check Your Understanding
Remember
Post Test