7

The periodic table has 7 periods.

There are 18 groups and 7 periods in the modern periodic table.

7 periods and 12 groups

There are seven periods in any periodic table.

there are 7 periods in modern periodic table

There are 7 periods in the periodic table.

The periodic table has 7 periods on it.

Th horizontal rows are referred as periods. There are 7 periods in periodic table.

There are 9 periods on the periodic table, with the 8th and 9th periods on the extended periodic table (Actinides and Lanthanides).

There are 7 periods in the modern periodic table.

The modern periodic table has seven periods.

7 The periodic table has 7 periods and 18 groups.

The periodic table contain 7 periods.

there are 7 periods in the periodic table118

Horizontal rows are termed as periods. There are 7 periods in periodic table.

Periods are the horizontal rows in the periodic table of Mendeleev; this table contain 7 periods.

Modern periodic table has 7 periods and 18 groups.

There are 18 groups and 7 periods in the periodic table.

Periods are horizontal rows. There are 7 periods in periodic table.

7 periods and 18 groups are there on the modern periodic table.

there are 7 periods and 18 groups that make up the periodic table.. =) Asma.

At present (2016) there are 7.

Periodic table has seven rows.They are known as periods of periodic table.