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de-Broglie equation is:
(1) n γ= 2d sin θ
(2) E= hv
(3) E= mc2
(4) γ= h/ mv
Ans: γ= h/ mv
why is the valence electron 4s2 in the elelment Sc21 and not 3d1?
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alkali metals belong to s-block in the periodic table.why?
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