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The elements are listed in the order of how many atoms they have.

For example, hydrogen is the first element on the periodic table. Hydrogen is the smallest element, and has one atom.

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15y ago
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12y ago

They Are numbered by how many protons there is

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9y ago

These are groups - from 1 to 18.

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Q: How are the periods on the periodic table numbered?
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Related questions

How are periods on periodic table numbered?

from 1 to 7


What do you call a row and column on the periodic table?

A row on the periodic table is called a period, and a column is called a group or family. Periods are numbered from 1 to 7, and groups are numbered from 1 to 18.


What are the rows in the periodic table caaled?

The rows in the periodic table are called periods. There are 7 periods in periodic table.


What are characteristics of periods in the periodic table?

Periods have same shells. There are 7 periods in periodic table.


How many periods of element are on a periodic table?

The periodic table has 7 periods on it.


Are periods horizontal rows on the periodic table?

rows. the vertical columns are called periods


What are periods in the periodic table best represnted by?

The horizontal rows on the periodic table are periods.


How many periods are there on the modern periodic table?

The modern periodic table has seven periods.


What are periods in the periodic table mean?

Periods are horizontal rows. 7 periods are present in modern periodic table.


A horizontal row of elements on the periodic table is called?

A horizontal row of elements on the periodic table is called a period. Periods are numbered from 1 to 7, corresponding to the number of electron shells in an atom of the elements within that period.


What are the horizontal from left to right parts of the periodic table called?

The horizontal rows in the periodic table are called periods.


How many periods are on the periodic table?

7The periodic table has 7 periods and 18 groups.