Q3 of 64 Page 110

An alpha particle is also known as:

An alpha particle is obtained by removing 2 electrons from a helium atom. So, an alpha particle is doubly-charged helium ion.


Hence, the correct option is D.

More from this chapter

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1

The number of valence electrons in CL ion are:

 2

An atom with atomic number 9 and mass number 19 will have the following constituents:

 4

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

(i) The mass of the atom is assumed to be uniformaly distributed over the atom


(ii) The positive charge is assumed to be uniformaly distributed over the atom


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


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

 5

Rutherford’s α- 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?