atom and molecules , Chemistry

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Energy of electron of hydrogen atom in second Bohr orbit is: (1)-5.44x10 -19 j                (2)- 5.44x10 -19 kj               (3)-5.44x10 -19 cal

The number of electrons in the valence shell of calcium is: (1) 6        (2) 8        (3) 2        (4)4 Ans: 2

The shape of an orbital is given by the quantum number : (1) n                       (2) l          (3) m                    (4) s       Ans:  l

what is a crystal and why do crystals have regular faces?

Explain about the Dielectric  Breakdown Dielectric  Breakdown  of  a  dielectric  material  is  because of the excitation of electrons into the conduction band across energy

what are the periodicity of periodic properties in d and f block elements?

Benzyne - organic chemistry (1) 1, 2-Didehydrobenzene, C 6 H 6 and its derivatives are known as benzyne or arynes and the simplest member is benzyne.      (2) It is neutral re

Determine the molality of an aqueous solution that is 12.0 percent urea by mass

Maximum number of electrons present in N  shell is: (1) 18              (2) 32        (3) 2              (4) 8 Ans: 32

complete discription of van''t hoff factor