write down in brief the description of group and periods in Modern Periodic Table
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The atomic number of each element is written above the symbol. A period is a horizontal row of the periodic table. ... A group is a vertical column of the periodic table, based on the organization of the outer shell electrons.
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.
There are 18 groups in periodic table.
Explanation:
Answer:
The atomic number of each element is written above the symbol. A period is a horizontal row of the periodic table. ... A group is a vertical column of the periodic table, based on the organization of the outer shell electrons