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Periods are the horizontal rows in the periodic table of Mendeleev; this table contain 7 periods.
Horizontal rows are termed as periods. There are 7 periods in periodic table.
There are 7 periods in the modern periodic table.
there are 7peroids
rows. the vertical columns are called periods
The periodic table has 7 periods on it.
The modern periodic table has seven periods.
7The periodic table has 7 periods and 18 groups.
Periods are the horizontal rows in the periodic table of Mendeleev; this table contain 7 periods.
Horizontal rows are termed as periods. There are 7 periods in periodic table.
There are 7 periods in the modern periodic table.
there are 7 periods in the periodic table118
6 periods
there are 7 periods in the periodic table118
There are seven periods on the periodic table. The lanthanides are in period 6, and the actinides are in period 7.
There are 7 periods in the modern periodic table.
The periodic table of Mendeleev has 18 groups and 7 periods.