Chemistry
Oxide of sulphur present in the atmosphere are washed down by rains to cause :

Eutrophication in lakes
Lowering of pH of soil
Depletion of fossil fuel reserves
Industrial smog formation

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Chemistry
Atoms of different elements have

Same atomic number and same electronic configuration
Different atomic number and different number of valence electrons
Same number of electrons and neutrons
Different atomic number and same eletronic configu-ration

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