Atoms and Electrons – 2 – 4

66. The electrons in the third orbit of an atom have …….. energy than the electrons in the second orbit.

(a) more
(b) less
(c) the same
(d) none of the above

ANSWER

EXPLANATION

67. When an electron jumps from higher orbit to a lower orbit, it …….. energy.

(a) absorbs
(b) emits
(c) sometimes emits, sometimes absorbs
(d) none of the above

ANSWER

EXPLANATION

68. The electrons in the conduction band are known as ……..

(a) bound electrons
(b) valence electrons
(c) free electrons
(d) none of the above

ANSWER

EXPLANATION

69. In insulators, the energy gap between valence and conduction bands is ……..

(a) very large
(b) zero
(c) very small
(d) none of the above

ANSWER

EXPLANATION

70. In a conductor, the energy gap between valence and conduction bands is ……..

(a) large
(b) very large
(c) very small
(d) none of the above

ANSWER

EXPLANATION

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