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Grade 10 atomic struc, valency, writing form assignment
1. CHEMISTRY
Atomic Structure, Valency, Chemical Formula
Attempt ALL Questions.
Assignment #2
Name: Grade:
Submit assignment by Sunday (22/3/20)
1. Complete the following table by filling in the blanks. [ 5 marks]
Element Atomic number Mass number No. of neutrons Electron configuration
Na 23 12 2, 8, 1
Sr 87 2, 8, 18, 18, 8, 2
14C 8
P3− 15 16
V 51 2, 8, 11, 2
2. Write down electron configuration and valencies for [4 marks]
3Li 20Ca 16S 9F
EC = EC = EC = EC =
Valency = Valency = Valency = Valency =
Hence write formulae for [4 marks]
Lithium Flouride ______________________________________________
Calcium Flouride ______________________________________________
Lithium Sulfide _______________________________________________
Fluorine gas __________________________________________________
State the type of bonding present in EACH of the above substance. [4 marks]
3. Fluorine, can form either covalent or ionic bonds. Draw a ‘dot-and-cross’ diagram to
show the bonding in
(i) sodium fluoride, NaF [Na = 11, F =9] [3 marks]
(ii) chlorine fluoride, ClF [Cl = 17] [3 marks]
Your diagrams MUST show valence electrons only.
2. Sodium Fluoride
Chlorine Fluoride
(iii) State TWO physical properties that ClF would have. Account for ONE of these physical
properties. [2 + 2] marks.
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