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The energy of an electron in the first Bohr orbit of H atom is-13.6eV . The possible energy value(s) of the excited state(s) for electrons in Bohr orbits to hydrogen is(are):
(1) -3.4eV
(2) -4.2eV
(3) -6.8eV
(4) +6.8eV
Ans: -3.4eV
diamond is covalent.yet it has high melting point.why?
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