Structure of th...

Which of the following correctly represent the electronic distribution in the Mg atom?

Dalton’s atomic theory is successfully explained by

(i) Law of conservation of mass

(ii) Law of constant composition

(iii) Law of radioactivity

(iv) Law of multiple proportion

In the Thomson’s model of atoms, which of the following statements are correct?

(i) The mass of the atoms is assumed to be uniformly distributed over the atom.

(ii) The positive charge is assumed to be uniformly distributed over the atoms.

(iii) The electrons are uniformly distributed in the positively charged sphere.

(iv) The electrons attract each other to stabilise the atom.

When alpha-particles are sent through a thin metal foil, most of them go straight through the foil because

Which of the following statements about Rutherford’s model of atoms are correct?

(i) Considered the nucleus as positively charged.

(ii) Established that the a-particles are four times as heavy as a hydrogen atom.

(iii) Can be compared to solar system.

(iv) Was in agreement with Thomson’s model.

Rutherford’s a-particle scattering experiment showed that

(i) electrons have negative charge

(ii) the mass and positive charge of the atom is concentrated in the nucleus

(iii) neutron exists in the nucleus

(iv) most of the space in atom is empty

Which of the above statements are correct?

An atom with 3 protons and 4 neutrons will have a valency of

The ion of an atom has 2 negative charges. Mass number of the atom is 16 and the number of neutrons are 8. What is the number of electrons in the ion?