51. Except for one, all of the following describe an atom’s nucleus:
(a) Is positively charges
(b) is very dense
(c) Contains nearly all the atoms mass
(d) Contains nearly all of the atoms volume
answer
(d) Contains nearly all of the atoms volume
52. L-shell has sub-shell (s)?
(a) S
(b) S and P
(c) S, P and d
(d) S. P.d and f
answer
(b) S and P
53. The development of periodic table started in?
(a) 1800
(b) 1900
(c) 1700
(d) 1600
answer
(a) 1800
54. The vertical columns elements in the periodic table are called?
(a) Element
(b) Groups
(c) Metals
(d) None of these
answer
(b) Groups
55. A pattern of repeating properties at regular interval is called?
(a) Periodicity
(b) Atomic radius
(c) Atomic size
(d) Covalent radii
answer
(a) Periodicity
56. The distance between the, nucleus and the valence shell, of the atom is termed as?
(a) Periodicity
(b) Atomic radius
(b) Atomic size
(d) Covalent radii
answer
(b) Atomic radius
57. The halfway point between the nuclei of two atoms that are comparable to one another and are part of the same molecule with a single covalent bond?
(a) Periodicity
(b) Atomic radius
(c) Atomic size
(d) Covalent radii
answer
(d) Covalent radii
58. Which elements is in the same family as fluorine?
(a) Silicon
(b) Iodine
(c) Antimony
(d) Arsenic
answer
(b) Iodine
59. Which would have the smallest ionization energy?
(a) K
(b) P
(c) S
(d) Ca
answer
(d) Ca
60. An element has configuration 2.8.1, it belong to?
(a) Group I and II period
(b) Group 1 and V11 period
(c) Group 111 and l period
(d) Group VIl and111 period
answer
(a) Group I and II period
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