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MCQ-46
The radius of an atom cannot be measured precisely because
A. Atom has no sharp boundary
B. Size of atom changes from one compound to other
C. Finding probability of electrons never becomes zero
D. All of the above

Answer: D

MCQ-47
The half of _________ bond between two similar atoms covalently bonded in a molecule is called the covalent radius
A. Single
B. Double
C. Triple
D. All of these

Answer: A

MCQ-48
The ionization energies of III-A and VI-A show an abnormal trend while moving left to the right in a period, which can be best explained by
A. Atomic radius
B. Nuclear charge
C. Shielding effect
D. Mode of an electronic configuration

Answer: D

MCQ-49
The elements of ______, ______ and _______ show abnormally low values of electron affinity in every period
A. II-A, V-A, VIII-A
B. I-A, V-A, VI-A
C. III-A, VI-A, VIII-A
D. I-A, II-A, III-A

Answer: A

MCQ-50
The tendency of an atom to _______ is called electronegativity
A. Donate electron pair
B. Share electron pair
C. Gain electron pair
D. Attract shared electron

Answer: D