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What is a group/family on the periodic table?
What is a period on the periodic table?
composed of only one type of atom
cannot be broken down further
What are the three key points of Dalton's atomic theory?
all matter is made up of tiny particles called atoms
Define heterogenous mixture
components do not have a uniform composition throughout the sample
different components of a liquid mixture separate as they move at different rates up the surface of a piece of chromatography paper
consists of two or more elements always chemically combined in the same proportion
How did the old periodic table system work?
Representative elements had group numbers 1A to 8A
Transition elements have group numbers followed by the letter B
Define homogenous mixture
composition is uniform throughout the sample
two or more different substances that are physically mixed, but not chemically combined
How do you calculate the atomic mass for an average atom?
a weighted average of the masses of all the naturally occurring isotopes of that element
Define pure substance
Matter that has a fixed or definite composition
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