Periodic Table

All matter is made of .....

• energy 
• atoms 
• air
• chemistry

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.

how many groups are there in modern periodic table

• 8

• 9

• 18

• 17

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

The Modern Periodic Table of Elements is arranged by

• atomic mass
• atomic number
• valence electrons
• number of isotopes

• Periods
• Groups

• Periods
• Groups

• energy levels
• valence electrons
• protons
• neutrons

• Same group
• Same period