Periods and the vertical columns are groups
The columns are called groups and rows are called periods. There are 18 groups and 7 periods.
groups run top to bottom periods run left to right
False; That would be called groups. Periods are horiztonal rows.
Groups or families; all are arranged by the number of valence electrons.
Periods and the vertical columns are groups
The columns are called groups and rows are called periods. There are 18 groups and 7 periods.
Modern periodic table has 7 periods and 18 groups.
groups exist to assess people
The sum of all the fossils that exist is called that fossil record. It includes fossils from all geologic time periods.
7 periods and 18 groups are there on the modern periodic table.
There are 18 groups in the periodic table that categorize elements based on their similar chemical properties._rows."
Groups are vertical and contain chemical elements with similar properties; periods are horizontal.
groups run top to bottom periods run left to right
groups
Cadastral (land survey) records do not exist everywhere or for all periods of a specific place, but if they exist they can be helpful in tracing ancesters.
Radioactive elements exist in all groups of the periodic table.