periodic table

who discovered the first scientific and systematic periodic table

• Henry Mosley

• Dmitri Mendeleev

• John Dalton

• sir Isaac Newton

Which one is correct about mendeleev's periodic law

• Properties of elements are periodic function of their atomic mass

• the physical and chemical properties of elements are periodic function of their atomic number.

• physical properties of elements are periodic function of their atomic weight.

• chemical properties of elements are periodic function of their atomic number.

choose the correct statement

• the vertical column in the periodic table is called period

• the vertical column in the periodic table is called group

• the horizontal row in the periodic table is not called period

• none of the above

how many groups are there in modern periodic table

• 8

• 9

• 18

• 17

alkali metals are kept in ........

• IIA

• IIIA

• IA

• 0

Tags

NGSS.HS-PS1-1

Number of valence electrons in halogens is ..........

• 1

• 4

• 3

• 7

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

D block elements are known as .............

• Actinides

• Transition elements

• Lanthanides

• Noble gases

In which block, does the element Iron stand?

• d block

• p block

• s block

• f block

Tags

NGSS.HS-PS1-1

how many electrons can d orbital accommodate? (keep)

• 2

• 6

• 10

• 14

which group has the strong electronegative character

• alkali metal

• lanthanides

• inert gases

• halogens

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2