write short note on periodic trents in elements step by step
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The periodic table has undergone extensive changes in the time since it was originally developed by Mendeleev and Moseley. Many new elements have been discovered, while others have been artificially synthesized. Each fits property into a group of elements with similar properties.
The periodic table is an arrangement of the elements in order of their atomic numbers so that elements with similar properties appear in the same vertical column or group.
A period is a horizontal row of the periodic table. There are seven periods in the periodic table, with each one beginning at the far left. A new period begins when a new principal energy level begins filling with electrons. Period 1 has only two elements (hydrogen and helium), while periods 2 and 3 have 8 elements. Periods 4 and 5 have 18 elements.
Periods 6 and 7 have 32 elements because the two bottom rows that are separated from the rest of the table belong to those periods.
Groups are vertical columns (down) the table. Atomic number increases as you move down a group or across a period.