Classification of Elements and Periodicity in Properties NDA Questions

NDA Chemistry

Classification of Elements and Periodicity in Properties MCQ Questions


7.
The term atomic size refers to the _____ of an atom.
A.
Radius
B.
Mass
C.
Metal
D.
Position
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ANSWER :
A. Radius
8.
The atomic size may be visualised as the distance between the centre of the nucleus and the _____ shell of an isolated atom
A.
Inner
B.
Outermost
C.
Centre
D.
None of these
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ANSWER :
B. Outermost
9.
In Newlands' Octaves, what were the two elements where their properties found to be the same?
A.
Sodium and Potassium
B.
Lithium and Sodium
C.
Argon and Neon
D.
Oxygen and Boron
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ANSWER :
B. Lithium and Sodium
10.
Among the elements on the periodic table, how many elements are naturally occurring?
A.
94
B.
10
C.
105
D.
87
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ANSWER :
A. 94
11.
In the modern periodic table, moving from left to right in a period, whether the atomic number increase or decrease?
A.
Backward
B.
Forward
C.
Decrease
D.
Increase
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ANSWER :
D. Increase
12.
With the discovery of _____, the Law of Octaves became irrelevant
A.
Solutions
B.
Metalloids
C.
Noble gases
D.
Metals
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ANSWER :
C. Noble gases