structure of atom

Rutherford’s alpha-particle scattering experiment was responsible for the discovery of

• NEUTRON

• PROTON

• ELECTRON

• ATOMIC NUCLEUS

Isotopes of an element have

• the same physical properties

• different chemical properties

• different number of neutrons

• different atomic numbers.

Number of valence electrons in Cl– ion are:

• 16

• 8

• 17

• 18

FIND - mass number , number of protons , number of electrons and name of the atomic species.

find Sulphur- number of neutrons, number of proton and number of electrons.

J.J. Thomson proposed that the nucleus of an atom contains only nucleons.

• TRUE

• FALSE

A neutron is formed by an electron and a proton combining together. Therefore, it is neutral.

• TRUE

• FALSE

An isotope of iodine is used for making tincture iodine, which is used as a medicine.

• TRUE

• FALSE

Which one of the following is a correct electronic configuration of sodium?

• 2,8

• 8,2,1

• 2,1,8

• 2,8,1

Which of the following led to the discovery of neutrons?

• discharge tube experiment

• alpha ray scattering experiment

• chadwick's experiment

• oil drop experiment