A part of periodic table is given.
As we move from left to right,
Li | Be | B | C | N | O | F |
Na | Mg | Al | Si | P | S | Cl |
What happens to the reactivity of electropositive elements within a group? why?
How modern periodic table is superior to Mendeleev's periodic table.
Point out the anomalies of Mendeleev's periodic table.
Why is the position of Hydrogen still controversial in modern periodic table?
Why did Mendeleev leave some gaps in his original periodic table?
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