8.4 Chemical Families

Question 1

Chemical family

Answer 1

Group of elements that have similar properties and form compounds with similar properties

Question 2

Alkali metals

Answer 2

-first column
-ion charge of +1
-soft , low density, that can be cut with knife
-commonly found as ions in salt and seawater
-Not found free in nature because they react with air and water
- Most reactive metals
-Good conductors
-Low melting point
-silver grey colour

Question 3

Alkaline earth metals

Answer 3

-second column
-ion charge of +2
-hard, have low density
-react with air and water
-found as ions in rock minerals
-colour silvery white
-Good conductors
- very reactive
-High melting point

Question 4

Halogens

Answer 4

-second to right
-not found free in nature because they react with many other elements
-ion charge of 1-
-All toxic in element form
-Range of bright colours as gases
-low boiling point
-very toxic

Question 5

Noble gases

Answer 5

-Last column
-non reactive
-tasteless, colourless, odourless, -non-toxic (except radon)
- very low boiling point
-Ion charge 0

Question 6

Hydrogen

Answer 6

-forms either positive or negative ions
-Behaves either as highly reactive metal or highly reactive non metal, dependenkng on element it combined with.
- colourless
-lowest density of all elements
-extremely low boiling point
-ion charge +1 or -1
- very reactive burns in air