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What is an element?
An element is a substance made up of only one type of atom, sp where all the atome of a substance have the same number of protons.
Approximately how many different elements are there?
There are approximately 100 different elements
What is an isotope?
Isotopes are different forms of the same element, which have the same number of protons but a different number of neutrons.
Carbon-12 and carbon-13 are isotopes of carbon. How do they differ?
They have different number of neutrons: Carbon-12 has 6 neutrons Carbon-13 has 7 neutrons
What does relative atomic mass mean?
Relative atomic mass in the average mass of all the isotopes of an element, taking in to account the abundance and mass number of each isotope.
What is the formula for relative atomic mass?
Relative atomic mass = sum of (isotope abundance x isotope mass number) / sum of abundances of all the isotopes
What is an element symbol?
An element symbol is a one or two letter abbreviation for a chemical element's name. For example: hydrogen is 'H', carbon is 'C', Helio is 'He', sodium is 'Na'
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