Groups and periods- Periodic Table

Question	Answer
What is a group?	Vertical column of elements in the periodic table
What is a period?	A horizontal row of elements in the periodic table
What are the 4 main groups	Alkali metals, Alkaline Earth metals, Halogens, Noble gases
Periods	Increasing atomic number, each new period has elements with an increasing number of shells
Groups	Located below each other on the periodic table, similar properties and electron configuration
Periods properties	elements of the same period have the same number of electron shells; with each group across a period, the elements have one more proton and electron and become less metallic
Amount of periods	7 Periods occur in nature, with the number of shells denoted by n=1 etc.
History of groups and periods	Groups developed from the notion of Dobreiner Triads, periods from the law of octaves

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	Created by eoin.examtime about 10 years ago

	Copied by mia.rigby about 10 years ago