Question

Q8.State seven characteristics of long form of periodic table.​

Answer 1

(i) There are in all 18 vertical columns i.e. 18 groups in the long form periodic table.

(ii) There are groups numbered from 1 to 18 from the left.

(iii) There are seven horizontal rows called periods. (iv) The elements of groups 1, 2 and 13 to 17 are called main group elements.

(v) The elements of group 3 to 12 are called transition elements.

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Answer 2

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Salient feature of long form of periodic table:

• This table consists of seven horizontal rows called periods.

• First period cons1sts 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 elements.

• Elements of a period show different properties.

• There are 18 vertical columns in the periodic table numbered I 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.

I recall you that there are only six salient features or characteristics not seven.