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51
What is the first metallie element in the modern periodic table?
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Answer: Option A
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52
What is Mendeleev's recurrent law based on?
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Answer: Option C
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53
In the modern periodic table, there are only gases are presetn in the . . . . . . . . period.
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Answer: Option B
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54
In Mendeleev's periodic table, . . . . . . . . before the nickel?
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Answer: Option C
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55
The alkali metals have relatively low melting point.Which one of the following alkali metals is expected to have the highest melting point?
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Answer: Option A
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56
To remove one electron from the outermost orbit or the shell of the neutral gaseous atom . . . . . . . . is needed.
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Answer: Option A
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57
The ionization energy of an element depends on the . . . . . . . .
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Answer: Option A
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58
Who classified elements based on atomic numbers?
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Answer: Option B
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59
In which of the following groups of modern periodic table, noble gases are placed?
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Answer: Option D
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60
Elements . . . . . . . . were placed in the periodic table of Newland with halogens.
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Answer: Option D
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