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46. Arrange the Li, Be, B, C, N elements according to increasing order of atomic radii (NTSE Punjab, Stage-I, 2016-17)
N < C < B < Be < Li
C < Li < N < Be < B
Li < Be < B < C < N
B < Be < Li < C < N
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47. All the elements in a group have the (NTSE Madhya Pradesh, Stage-I, 2016-17)
Same valency
Different valency
Variable valency
None of these
48. Bromine is a (NTSE Madhya Pradesh, Stage-I, 2016-17)
Non-metal
Metal
Metalloids
49. Which of the following statements is not a correct statement about the trends when going from left to right across the periods of periodic table? (NTSE Rajasthan, Stage-I, 2015-16)
The elements become less metallic in nature
The number of valence electrons increases
The atoms lose their electrons more easily
The oxides become more acidic
50. Electronic configuration of an atom is 2, 8, 1. Which of the following elements is similar with it in chemical reactivity? (NTSE Rajasthan, Stage-I, 2016-17)
K
CI
N
Ar
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