How are periods useful in the periodic table?

Answer 1

On a period on the Periodic Table, each element increases by Atomic Mass and by atomic number when read from left to right. It is 'periodic' as in 'appearing at regular intervals' in that elements in a vertical column tend to have similar properties. For example, Fluorine and Chlorine and Bromine appear in the same column and each forms salts with the same metals in the same atomic ratios. Mendeleev was able to predict the existence of some previously unknown elements because of this property of his table.

Answer 2

Periods in the periodic table are useful for organizing elements based on the number of electron shells they have. Elements in the same period have the same number of electron shells, which helps predict their chemical properties and reactivity. Additionally, periods help in understanding trends in atomic size and electronegativity across the table.

Answer 3

The no of period of periodic table tells the no of shells in atoms, so their atomic sizes and other physical properties may be imagined.