an element X has atomic number 19 and it's mass number is 39. calculate the number of electrons and neutrons in it.

ATOMIC NO. = NO. OF ELECTRONS = 19
MASS NO. = NO. OF PROTONS + NO. OF NEUTRONS
NO. OF ELECTRONS = NO. OF PROTONS , SO MASS NO., 39  = 19 + NO. OF NEUTRONS
NO. OF NEUTRONS =39 - 19 = 20
THIS ELEMENT IS POTASSIUM

  • 5
HOPE IT HELPS..........IF IT DID THAN PLZ MARK IT UP
  • 1
hey bro its easy
NO. OF PROTON =NO. OF ELECTRON
THEREFORE it has 19 PROTON

MASS OF AN ATOM=NO.OF(NEUTRON +PROTON

THEREFORE 39-19=20
  • 5
20
  • 3
What are you looking for?