1. An element is defined by the number of .......... in the atom or ion. a) Elec

Question

1. An element is defined by the number of .......... in the atom or ion.

a) Electrons

b) Protons

c) Neutrons

2. I have atoms of 2 isotopes of the same element. The atoms will have the same number of:

a) Electrons

b) Protons

c) Neutrons

d) B and c

e) A and b

3. Chemical reactions involve changes in what part of the atom?

a) Electron cloud

b) Nucleus

c) Both

4. Give a typical energy/atom for a chemical reaction.

5. Nuclear reactions involve changes in what part of the atom?

a) Electron cloud

b) Nucleus

6. Give a typical energy released per atom in a nuclear reaction.

Explain why your answer is many orders of magnitude greater than your answer for Q4

Explanation / Answer

1) Electron

2) Isotopes have same number of Electron and Protons hence option 'e'

3) In chemical reaction, only electron participate hence electron cloud. Option 'a'

4) Order of few eV to keV

5) In nuclear reaction, nucleons participate hence Nucleous. Option 'b'

6) Energy released for nuclear reaction are order of MeV. This is due to the fact that nucleons binding energy is far greater (of the order of MeV) then binding energy of electron (eV) in atom.

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