Mendeleev's table, modern periodic law, periodic trends in groups and periods.
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Q1 · Periodic Classification · MEDIUM
In Mendeleev's periodic table, elements were arranged in the increasing order of their atomic masses. Three elements A, B and C have atomic masses X, X+1 and X+2 respectively. If element B is removed from this sequence, then A and C would form a Dobereiner's triad if:
Q2 · Periodic Classification · EASY
Which of the following statements about the modern periodic table is correct?
Q3 · Periodic Classification · HARD
An element X has atomic number 13 and mass number 27. Another element Y has atomic number 20 and mass number 40. When these elements are placed in the modern periodic table, which of the following statements is true about the trend in atomic radius?
Q4 · Periodic Classification · MEDIUM
An element X has atomic number 12. What will be its position in the periodic table?
Q5 · Periodic Classification · MEDIUM
In the modern periodic table, elements are arranged in order of increasing: