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Who was the scientist to classify the elements in triads? 16

Dobereiner classified the elements in triads.

Who classified the elements in octaves? 17

Newlands classified the elements in octaves.

How many elements are there in the second and the third period of the Modern Periodic Table? 23

There are 8 elements in the second and the third period of the Modern Periodic Table.

How many elements are there in the fourth and the fifth period of the Modern Periodic Table? 23

There are 18 elements in the fourth and the fifth period of the Modern Periodic Table.

Where are alkali metals placed in the Modern Periodic Table? 23

Alkali metals are placed in Group 1 of the Modern Periodic Table.

Where are alkaline earth metals placed in the Modern Periodic Table? 23

Alkaline earth metals are placed in Group 2 of the Modern Periodic Table.

Where are halogens placed in the Modern Periodic Table? 23

Halogens are place in Group 17 of the Modern Periodic Table.

Where are inert gases placed in the Modern Periodic Table? 23

Iner gases are place in Group 18 (or Group 0) of the Modern Periodic Table.

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This page was last modified on
30 July 2019 at 03:18