Question

Group and period of difference between​

Answer 1

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. There are a total of 18 groups.

Answer 2

Answer:

Periods are the horizontal rows in the periodic table. All the chemical elements in this row have the same number of electron shells. When we go through a row, the number of protons in the atomic nucleus increases by 1 for each next element in the period. Moreover, the elements get less metallic when we move forward a row.

Groups are the vertical columns in the periodic table. All the chemical elements in the same group contain an equal number of valence electrons. For example, the number of valence electrons in the group 1 is 1. Most of the times, the elements in the same group shares somewhat similar chemical and physical properties. There are mainly 18 groups in the periodic table. However, some groups have common names as well. For example, we call the group 1 element as alkali metals and group 2 elements as alkali earth metals .

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