Q15 of 37 Page 54

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

(a) Atomic nucleus (b) Electron


(c) Proton (d) Neutron

(a) Atomic nucleus

According to the Rutherford’s model of an atom, there is a positively charged center called nucleus. Almost all the mass of an atom resides in the nucleus. The electrons revolve around the nucleus in well defined orbits which can be compared to the solar system.


More from this chapter

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14

For the following statements, write T for true and F for false:

The mass of an electron is about 1/2000 times that of a proton.

 14

For the following statements, write T for true and F for false:

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

 16

Isotopes of an element have :

(a) the same physical properties


(c) different number of neutrons


(b) different chemical properties


(d) different atomic numbers

 17

Number of valence electrons in Cl- ion are:

(a) 16


(b) 8


(c) 17


(d) 18