| What is an isotope? | Atoms of the same element which have the same proton number but different nucleon number. |
| What is a radioactive isotope? | An isotope with an unstable nucleus. |
| What is a radioactive isotope? | An isotope with an unstable nucleus. |
| Give three uses of radioisotopes | To treat cancer
To kill germs and bacteria (sterilization)
To check for oil pipe leaks |
| Why are the chemical properties of all isotopes similar. | Since the number of valency electrons are similar their chemical reactions are similar too. |
| Give five physical properties of Non-metals | Brittle(breaks easily)
Do not conduct heat or electricity
Low boiling and melting points
Looks dull in solid state
Low density solids |
| Give five physical properties of Metals | Hard and strong
Malleable(can be hammered into different shapes) and Ductile (drawn out to make wires)
High density
High melting and boiling points
Good conductors of electricity of heat
Looks shiny when polished |
| Give two chemical properties of Non-metals | Form negative ions when they react
React with Oxygen to form oxides that are acidic(Their aqueous solutions will turn litmus red) |
| Give two chemical properties of Metals | Form positive ions when they react
Reacts with oxygen to form oxides that are bases(the oxides can neutralise acids) |
