This lesson contains 17 slides, with interactive quizzes and text slides.
Items in this lesson
3.1. The atomic model - isotopes
3. The structure of substances
Slide 1 - Slide
Atomic model
An atom is composed of protons, neutrons and electrons. The 1+ charged protons (p) and the neutral neutrons (n) are in the atomic nucleus The 1− charged electrons (e-) are in a cloud around the atomic nucleus.
Slide 2 - Slide
Number of particles
atomic number = number of protons (determines type of atom)
number of electrons = number of protons (no charge)
mass number = number of protons + number of neutrons
Slide 3 - Slide
Isotopes
The same element - different mass
Same number of protons; different number of neutrons
Slide 4 - Slide
Other notation: P-31
Notation of isotopes
Slide 5 - Slide
Isotopes
Slide 6 - Slide
Slide 7 - Slide
Types of substances
Type
Consist of
Metal
metal-atoms
Molecular substance
non-metal atoms
Salt
metal- and non-metal atoms
Slide 8 - Slide
Types of substances
Type
Solid
Liquid
Dissolved in water
Metal
yes
yes
-
Molecular substance
no
no
no
Salt
no
yes
yes
Slide 9 - Slide
What type of substance conducts electricity at the solid phase?
A
Metals
B
Salts
C
Molecular substances
Slide 10 - Quiz
What type of substance consists of a metal and a non-metal
A
Molecular substances
B
Metals
C
Salts
Slide 11 - Quiz
Sodium has atomic number 11 and mass number 24. How many protons does sodium have?
A
11
B
12
C
23
D
34
Slide 12 - Quiz
Sodium has atomic number 11 and mass number 24. How many electrons does sodium have?
A
11
B
12
C
13
D
34
Slide 13 - Quiz
Sodium has atomic number 11 and mass number 24. How many neutrons does sodium have?
A
11
B
12
C
13
D
24
Slide 14 - Quiz
When a neutron joins the nucleus then ...
A
the atom number becomes higher
B
the atom number becomes lower
C
the mass number becomes higher
D
the mass number becomes lower
Slide 15 - Quiz
N-14 has 7 protons and 7 neutrons. C-14 has 6 protons and 8 neutrons. N-14 and C-14 are isotopes