Periodic Table.

Who discovered the Hydrogen atom?

• Joseph priestley

• Henry Cavendish

• Henry moseley

• Mendeleev

Identify the scientist

• Dmitri Mendeleev

• Sir Issac Newton

• Albert Einstein

• Antoine Lavoisier

The elements with atomic number 4,12,20,38 and 56 belongs to :

• Alkaline metals

• Alkaline earth metals

• Halogens

• Noble gas

Who gave the 'Law of octaves'?

• Dobereiner

• Lothar Meyer

• Mendeleev

• Newlands

Each transition series contains a total of

• 2 elements

• 8 elements

• 10 elements

• 18 elements

How many periods are there in the long form of the periodic table?

• 7

• 6

• 9

• 8

An elements of 2nd period has __no:of shells

• 6

• 2

• 3

• 4

14 elements after actinium is called

• d-block elements

• Actinides

• Lanthanides

• p-block elements

Which of the following properties generally decreases along a period?

• Metallic character

• Ionisation energy

• Electron affinity

• Valency

An elements whose last electron enters into s-subshell is a__block element

• p

• d

• s

• f