Question

 In the longform periodic table x and  y period  have three physical states of elements .Then the sum of the x and y is​

Answer 1

Answer:

Modern periodic law states that the physical and chemical properties of elements are the periodic functions of their atomic number.

There are 18 groups and 7 periods present in the modern periodic table.

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Answer 2

The sum of x and y is 25.

Reason:

• The Long-form of Periodic Table is the modern periodic table created after the Mendeleev's Periodic Table.

• It has 7 horizontal rows known as Periods.

• It has 18 vertical columns known as Groups.

The value of y = 7 and x = 18.

Now , the modern periodic table represents elements in 3 physical states namely solid, liquid and gas.

So, x + y = 18 + 7 = 25.

So, final answer is

$\boxed{ \sf{ \large{x + y = 25}}}$