Periodic table of elements - Chemistry

Question 1

How many elements are in the periodic table of elements?

Answer 1

There are 118 elements in the periodic table of elements.

Question 2

How many groups are in the periodic table of elements?

Answer 2

There are 18 groups in the periodic table of elements.

Question 3

How many periods are in the periodic table of elements?

Answer 3

There are 7 periods in the periodic table of elements.

Question 4

Who made the first periodic table of elements?

Answer 4

Dmitri Mendeleev made it and some spaces were left empty.

Question 5

Why were there empty spaces in Dmitri’s periodic table?

Answer 5

He corrected the known atomic masses of some elements and he used the patterns in his table to predict the properties of the elements he thought must exist but had yet to be discovered. He left blank spaces in his chart as placeholders to represent those unknown elements.