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level: Atoms and Elements

Questions and Answers List

level questions: Atoms and Elements

QuestionAnswer
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 radioisotopesTo 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-metalsBrittle(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 MetalsHard 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-metalsForm 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 MetalsForm positive ions when they react Reacts with oxygen to form oxides that are bases(the oxides can neutralise acids)