51.
The following options depict a particular characteristic of elements and their variation in the period from left to right and top to bottom in the group: Characteristics of the element - left to right in the period-top to bottom in the group
Select the correct option.

54.
In the modern periodic table, the elements are arranged:

55.
The first element of each period has 1 valence electron and the last element of each period . . . . . . . . have electrons. (Except helium)

57.
The electronic configuration of an element is 2, 8, 1. It is included in . . . . . . . .

59.
In the modern periodic table in a same group the elements have . . . . . . . . of their atoms.

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