Question

Salient features of long form of periodic table.​

Answer 1

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Salient features of long form of periodic table are given below:

• This table consists of seven horizontal rows called periods.

• First period consists of only two elements. Second and third periods consist of 8 elements each. Fourth and fifth periods consist of 18 elements each. Sixth period has 32 elements while seventh period also has 32 elenments.

• Elements of a period show different properties.

• There are 18 vertical columns in the periodic table numbered 1 to 18 from left to right, which are called groups

• The elements of a group show similar chemical properties.

• Elements are classified into four blocks depending upon the type of the subshell which gets the last electron