Lesson 1-3, Exercises of Chemistry

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Lesson 1 Learning Outcomes

By the end of the lesson you should be able to …

• Use nuclide notation to work out the number of protons,

neutrons and electrons in an atom…

• To write the electron arrangement of the first 20 elements

and draw how electrons are arranged in an atom.

• To refer to the electron arrangement on page 6 of the data

booklet.

• Explain that elements within a group have similar chemical

properties because they have the same number of electrons

in their outer energy levels.

Using Nuclide Notation

• How many protons and neutrons are present in these atoms?

Na

Fe

Sn

F

Al

11p,

12n

26p,

30n

50p,

69n

9p,

10n

13p,

14n

Starter Question

Complete the table the first example has been done for you

Electrons are arranged in shells or energy levels that orbit the nucleus.

Example 1. Hydrogen

Electron arrangement = 1

Electron Arrangement

= 1 electron

https://www.twigscotland.com/hi/7CCQOC46XUVT?next=https://www.twigscotland.com/film/atom-

structure-electron-shells-1346/

Twig Video: Atom Structure – Electron Shells

How Many Electrons per Shell?

• Each shell has a maximum number of electrons that it can hold

1st Shell: 2 electrons

2

nd

Shell: 8 electrons

3

rd

Shell: 8 electrons

The maximum

C

The inner shell has __ electrons

Electron arrangement = 2,

Example 2. Carbon = 6 electrons

The next shell has __ electrons

2

4

Example 3. Sulphur = 16 electrons

The inner shell has __ electrons

The next shell has __ electrons

The next shell has __ electrons

S

Electron arrangement = 2,8,

2

8

6

Example 4. Potassium

Using your data booklet

Draw the electron structure of potassium

K

protons

Example 4. Potassium

Using your data booklet

Draw the electron structure of potassium

K

Nucleus

Electron arrangement

= 2,8,8,

Print this sheet out Using your data book complete for the first 20 elements

E.g. Lithium has 3

electron in the

configuration 2,

Sodium has 11

electrons in the

configuration 2,8,

Potassium has 19

electrons in the

configuration ,,__

Elements in the same group have the same

number of electrons in the outer shell

(this is their group number)

e.g. every element in group 2 has two electrons

in their outer shell, e.g. magnesium.

Patterns in electron arrangement?

E.g. all group 1 metals

have __ electron in

their outer shell

These elements have

__ electrons in their

outer shells

These elements

have __ electrons

in their outer shell

Add this information to your printed diagram