Up and down.
Periods on the periodic table go across and are based on the number of unexcited electrons increasing as you read across. Groups on the periodic table are read down the table and share the same number of valence electrons.
Electronegativity increases across (left to right) the periodic table and decreases on going down.
Left to right are columns: rows go up to down!
As with any grid, the periodic table has rows running left to right, and columns running up and down. The rows are called PERIODS and the columns are called GROUPS.
Periods (across the periodic table) have increasing atomic mass. Groups (down the table) have similar properties and reactive natures.
THEY GO ACROSS NOT UP AND DOWN. THAT IS FOR COLUMNS.
No that would be rows. Columns go down.
The density properties generally change as you go down the columns of the Periodic Table by increasing.
groups on the periodic table are the vertical coumns that go up and down. A period on the periodic table are the rows that go horizontal or across.
Rows go across and columns go up and down.
His original 1869 table had the atomic weights increasing down columns, and family members alongside each other in horizontal rows. His revised and greatly improved 1871 version had atomic weights increasing across rows, and element families in vertical columns, essentially similar to the way a modern Periodic Table is presented.
Periods on the periodic table go across and are based on the number of unexcited electrons increasing as you read across. Groups on the periodic table are read down the table and share the same number of valence electrons.
The periodic table has 7 rows and 32 columns.
It is called a group
The melting temperature properties generally change as you go down the columns of the Periodic Table by decreasing for metals and increasing for non-metals.
Electronegativity increases across (left to right) the periodic table and decreases on going down.
Electronegativity increases across (left to right) the periodic table and decreases on going down.