Periods are going horizontal from the periodic table and groups are going across of the periodic table.
Lines of longitude appear as vertical lines (up and down) on the map running from the North pole to the South pole.
Across a period, first ionization energy increases. However, when going down a group, first ionization energy generally decreases. As you go down a group, atoms hove more total electrons so they don't really care that much about their outermost ones.
Density varies across and up and down the periodic table because as the atomic weight of an element increases, so does its density.
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periods go across, and families/groups go down.
period go down the periodic table of elements and groups go across.
THEY GO ACROSS NOT UP AND DOWN. THAT IS FOR COLUMNS.
The chemical properties are similar down a group. There is no specific pattern across periods.
Periods are the elements on the periodic table that go across, in rows. So basically going across each row is called a period
Latitude lines go -------- (across) And Longitude goes | | | (up & down)
The horizontal line (Row Across) is called periods, and the verticle columns (Row down) anre called groups.
When moving left to right across the PT the ionization energy increases. As you go down, the ionization energy, decreases.
Up and down.