Glossary

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mass number (A)

Subject: 

  • Physical Sciences

the sum of the number of protons and neutrons (the nucleons) in the nucleus of an atom. It determines the mass of the element.

Related Terms: 

proton
neutron
nucleus

Related Content

molecule
Subject:
Physical Sciences

a group of atoms held together by chemical bonds.

metals
Subject:
Physical Sciences

a group of elements that are good conductors of heat and electricity.

collision theory
Subject:
Physical Sciences

the theory whereby molecules undergo effective collisions to form new molecules.

electrolysis
Subject:
Physical Sciences

the use of an electric current to cause chemical change in a liquid.

initiation
Subject:
Physical Sciences

the initial step needed to start polymerisation.

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Exam practice is essential. Make sure your students have access to practice exam papers for the subjects they take. Make sure the exam papers relate to the correct version of the curriculum.

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Remind your students that studying should be active. They should be making notes, working through examples, doing practice exam papers and testing themselves on the sections they are studying.

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Formulae sheets or key concept sheets are useful for quick revision. Make some sheets your students can stick on a wall or at the back of their books. The more they look at the formulae and key...

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Different study methods work for different students. Encourage your learners to find out what works for them so you can support them.

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Many subjects require students to know work from the previous grades. Make sure your child has access to a good reference book that contains the concepts they need to refer back to.

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On the morning of the exam, get your child to go over his formulae sheets to remind him of key information.

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Once your teenager has completed practise exam papers, go over the areas where they struggle. Get a study guide to help you and your student if you need help with a particular section.

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Exam practice is essential. Make sure your student has access to practice exam papers for the subjects they take. Make sure the exam papers relate to the correct version of the curriculum.

[ more ]

Studying should be active. Your child should be making notes, working through examples, doing practice exam papers and testing herself on the sections she is studying.

[ more ]

Formulae sheets or key concept sheets are useful for quick revision. Get your teenager to stick them on the wall in their room. The more they look at the formulae and key concepts, the more likely...

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Different study methods work for different students. Find out what works for your child so you understand how you can support him or her.

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