periodic table, Chemistry

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History of periodic table

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Basic concepts, what are ion? under what conditions are they produced?

what are ion? under what conditions are they produced?

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By which cycle form a helium nucleus?, Q) Inside the sun four hydrogen nucl...

Q) Inside the sun four hydrogen nuclei combine to form a helium nucleus by which cycle? Ans) Proton-proton cycle.

Water will not compress, Water will not compress Fit a soda water bottl...

Water will not compress Fit a soda water bottle with a one-hole stopper. By the stopper place the glass tube from a medicine dropper, narrow end up. Fill the bottle to the top

Number of unpaired electrons, The number of unpaired electrons in Fe 3+ (Z...

The number of unpaired electrons in Fe 3+ (Z= 26)  are: (1) 5        (2) 6        (3) 3        (4) 4 Ans: 5

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