Experiments of different scientists showed that atom is made up of electrons, protons
and neutrons. Chedwick obtained neutrons by bombarding Be with α particles.
However, in the past 20 years or so, scientists have discovered a number of other
subatomic particles like quarks, leptons, bosons, glucons etc. The properties of some of
these have become well known but there is still much to learn about others. Finding out
about these and possibly other subatomic particles, is one of the challenge of the 21st
century.
(a) Which statement is correct about canal rays?
(i) They are positively charged.
(ii) They move from anode to cathode.
(iii) They also known as anode rays.
(iv) All of the above.
(b) How was it shown that an atom has a lot of empty space within it?
(i) Thomson’s model of an atom
(ii) Rutherford’s alpha rays scattering experiment.
(iii) Bohr’s model of an atom for shells.
(iv)None of the above.
(c) The subatomic particle which is not present in the nucleus and directs the properties
of atom is
(i) Proton
(ii) Electron
(iii) Neutron
(iv) Proton and neutron
(d) An element whose atomic no. is 12 its valency will be:-
(i) 1 (ii) 2 (iii) 3 (iv) 4
(e) Atomic mass of an atom is 31 and atomic no. is 15 than number of neutrons will be:-
(i) 15 (ii) 31 (iii) 16 (iv) 14
Answers
Answer:
Experiments of different scientists showed that atom is made up of electrons, protons
and neutrons. Chedwick obtained neutrons by bombarding Be with α particles.
However, in the past 20 years or so, scientists have discovered a number of other
subatomic particles like quarks, leptons, bosons, glucons etc. The properties of some of
these have become well known but there is still much to learn about others. Finding out
about these and possibly other subatomic particles, is one of the challenge of the 21st
century.
Explanation:
here is your answer✌️
Answer:
(a) Which statement is correct about canal rays?
Answer:- Option (iv) All of the above.
(b) How was it shown that an atom has a lot of empty space within it?
Answer:- Option (ii) Rutherford’s alpha rays scattering experiment.
(c) The subatomic particle which is not present in the nucleus and directs the properties.
Answer:- Option (iii) Neutron
(d) An element whose atomic no. is 12 its valency will be:-
Answer:- Option (ii) 2
(e) Atomic mass of an atom is 31 and atomic no. is 15 than number of neutrons will be:-
Answer:- Option (iii) 16
HOPE THIS WILL HELP YOU TO CLEAR YOUR DOUBT!