Question

ℎℴℓα ღαℸℯş ℘ℓℯαşℯ αηşωℯr ღϒ qμℯşℸίℴη
¡) calculate the no. of electrons,protons & neutrons in an atom of an element with atomic no. 20 & mass no. 40.write the electronic configuration and draw the structure of this atom.​

Answer 1

Atomic number=20
Mass number=40

Number of electrons=20
Number of protons=20
Number of neutrons=20

Electronic configuration=2,8,8,2

Answer 2

Atomic number = 20

Mass number = 40

No. of protons = Atomic no. = 20

No. of neutrons = mass no.-Atomic no. = 40-20 = 20

No. of electrons = no. of protons = 20

Electronic configuration = 2,8,8,2