Valency of sodium is

  • 1
  • 4
  • 3
  • 2

Neutrons in an atom also affect the

  • chemical properties
  • physical properties
  • bonding properties
  • thermal properties

To find out number of neutrons in an atom, we need to know the

  • atomic number
  • proton number
  • electron number
  • mass number

The attraction of two ions due to opposite charge is known as

  • ionic bonding
  • covalent bonding
  • metallic bonding
  • dative bonding

To trace the path of phosphorus, the isotope of phosphorus which is added to the fertilizers, is

  • Phosphorus-31
  • Phosphorus-32
  • Phosphorus-33
  • Phosphorus-34

If the mass of protons and neutrons is 1, then the mass of electron is

  • 2
  • 2-Jan
  • 4-Jan
  • 1/1890

The name of physicist who discovered the nucleus of atom was

  • Democritus
  • John Dalton
  • Ernest Rutherford
  • Vander Waals
The symbol of "oxygen" is
  • N
  • O
  • Fl
  • C
The symbol of Nitrogen is
  • Bo
  • N
  • Br
  • C
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