Question

1) Ions are formed between positive or negative charge.

2) Which one is not an ionic compound?
a) LiCl
b) MgBr 2
c) CaO
d) HCl
3) Write down chemical formula of ionic compound between Potassium (K) and Sulfur (S)?
4) How many valence electrons Group 1 elements have?
5) When group 1 element want to become stable by forming an ion, what will be its
charge?
6) How many valence electrons group 2 elements have?
7) When group 1 element want to become stable by forming an ion, what will be its
charge?
8) How many valence electrons group 16 elements have?
9) When group 16 element want to become stable by forming an ion, what will be its
charge?
10) List two properties of ionic compounds.

Answer 1

1. No 1 looks like a statement and not a question.

2.Ionic compounds are usually formed from the transfer of electrons from metals to Non metals. All others are Ionic compounds except HCl(Its a covalent compound).

3. The Formula would be K2S. Exchange of Radicals takes place. Sulphur has a -2 charge and potassium has a +1 charge. when they both exchange radicals... The compound is K2S.

4.Group 1 elements have only 1 electron in their outermost shell.

5. its charge will be +1 because it loses the 1 electron in its outermost shell.

6.Group 2 elements have 2electrons in their Valence shell.

7.Already answered. same as No 5.

8. Group 16;Also known as group 6. They have only 6 electrons in their outermost shell.

9.When they want to become stable... they acquire 2electrons to complete their octet... so they possess a -2 charge by forming an ion.

10. i)They form ions when Dissolve in solutions

ii) They are hard and brittle

iii) They have high boiling points