ICSE /Class 9
Chemistry MCQ Based On Contributors to periodic law old
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ICSE Class 9 Chemistry Contributors to periodic law old
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Barium hydroxide
100+14
1st group elements have +1 as valency and oxygen has -2 as valency.
Tungsten
Atomic number 37
Mg is smaller in size.
Atomic Number 3
Boron and Silicon
Because their placement in the periodic table is due to their electronic configuration.
Atomic number 53.
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