3E Chemistry - Isotopes AND atomic structure

• Scheikunde
• Middelbare school
• vwo
• Leerjaar 3

Lesson goals:

At the end of the lesson I can:

- explain what an isotopes in;

- calculated the amount of neutrons in a certain isotopes.

Prior knowledge:

Dalton task week 31: Atomic structure

Questions?

The atomic mass of sodium is?

1. 11 u
2. 12 u
3. 23 u
4. 34 u

The amount of protons in this element is?

1. 11
2. 12
3. 23
4. 34

What is the atomic mass of this atom?

1. 7 u
2. 14 u
3. 21 u
4. 28 u

Drag the element symbol underneath to the correct atomic number, use your periodic table.

          32             28                92                 16                 99

U

Ge

Es

S

Ni

What is an isotope?

1. same atom, different mass
2. different atom, same mass
3. same atom, different atomic number
4. different atom, same atomic number

Isotopes differ in ...

1. Amount of protons
2. Amount of electrons
3. amount of protons and electrons
4. Amount of neutrons

Which depicted atoms are isotopes?

White sphere: neutron
Black sphere: proton

1. 1 and 3
2. 2 and 3
3. 1 and 2
4. 1, 2 and 5

Which nucleus represents an isotope of the first element?

1. None
2. 2
3. 3
4. 4

Iodine has an isotope with 127 particles in its nucleus.
This isotope has 53 protons and 74 neutrons.

How many electrons does this isotope of iodine have?

1. 21
2. 53
3. 74
4. 127

What is the amount of neutrons in
Sn-121?

1. 71
2. 70
3. 50
4. 121

Give the atomic masses of these three carbon isotopes.

1. 6-6-6
2. 6-7-8
3. 12-13-14
4. 18-19-20

Let's practice

Do in your notebook and check from your chemistry book:

- Q10 (p53); 

- Q11-13 (p55).