Task 1
P3: Describe atomic structures of elements 1-20, found in the
periodic table




Complete the electron structure worksheet for elements 1-20.
For each element you MUST write the number of neutrons and
protons
You should also write the short electron configurations for each
element. E.g. Lithium – 2.1
On the back of your worksheet give 2 examples of isotopes e.g.
Deuterium and Carbon-14
Task 2
P4: Carry out an investigation into the chemical properties of
elements in groups 1 and 7
Use the worksheets provided to record the results of your investigation
into the chemical properties of the elements in groups 1 and 7. Once
these investigations are completed you must get them signed off by
your subject teacher.
Your results should describe the following properties:
- Appearance (e.g. Colour, softness)
- State at room temperature
- Reaction of alkali metals with water
- Reaction of alkali metals with air
- Reactivity of group 1
- Reactivity of group 7
You should include a graphical representation of the melting/boiling
points of groups 1 and 7.
1
Task 3
M3: Describe the trends within the atomic structure of groups 1
and 7 in the periodic table
On a lined piece of paper – answer the following questions – you should
answer each question for group 1 and THEN for group 7.
1. What happens to the TOTAL number of electrons as you move down the
group?
2. What happens to the number of electrons in the OUTER shell as you go
down the group?
3. What happens to the number of SHELLS as you move down the group?
4. What happens to the number of PROTONS as you move down the
group?
5. What happens to the number of NEUTRONS as you move down the
group?
6. What happens to the size of the atom as you move down the group?
Task 4
M4: Explain why the elements of groups 1 and 7 are mostly used in
the form of compounds
In the form of an A4 poster using words and pictures:
-
Draw the electron structure of sodium and chlorine.
Describe how the above elements react to gain a full outer shell
and therefore become more stable
Explain why these elements are more useful in compounds such as
sodium chloride, sodium fluoride and potassium chloride.
Describe major uses of sodium chloride and sodium fluoride.
2
Task 5
D2: Explain the trends in the chemical behaviour of the elements
of groups 1 and 7 in relation to their electronic structure
You are to write a letter to Mr O to explain why the group 1 and
group 7 elements chemically behave the way they do.
Your letter MUST include:
- Electron structures of Na, Li, K and Cl, Br and I
- Description of the trends in their chemical behaviour (e.g.
reactivity, boiling/melting points)
- Explanation of these trends in terms of how they gain and lose
electrons. (e.g. Why is it easier for some elements than others)
Think about:
o Distance of outer electron
from nucleus
o Number of shells (shielding)
o Size of the atom
o Attraction of outer electron
to nucleus
3