Studied by 25 people
Who had the first idea of the existence of an atom and when?
john Dalton, 200 years ago
What particles are atoms made of?
protons, neutrons and electrons
What is within the nucleus and what orbits?
nucleus=protons and neutrons
orbit= electrons
What are two properties of protons, neutrons and electrons that are especially important?
mass and electrical charge
What is the number above a element?
mass number
What is the number below a element?
atomic number
How to count protons?
atomic Number from periodic table
How to count neutrons?
mass Number minus the number of protons
How to count electrons?
same as protons
What is an isotope?
atoms of the same element always have the same number of protons, they may have different numbers of neutrons
What are the properties of an isotope?
the isotopes of an element are identical in their chemical reactions.
How small is an atom?
thickness of a crisp
Note 
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