Shell model

many closely spaced lines in one spectral line is called

In Bohr's model, the electrons orbit the nucleus in ______.

15) An artificial satellite revolves round the earth in circular orbit, which quantity remains constant?

• Angular momentum

• Linear momentum

• Linear velocity

• Angular displacement

• A

• B

• C

• D

        J (total angular momentum) can be positive or negative.

• TRUE

• FALSE

• can't say

Which of the following was not a part of Dalton's theory of the atom?

• All elements are composed of atom

• Atoms of the same elemements have the same mass and atoms of different elements have different masses

• Compounds contain atoms of more than one element

• All atoms have the same number or protons, electrons, and neutrons

Around 1911, Rutherford suggested a planetary model of atomic structure. Which of the following was not a proposition of this model?

• Electrons revolve in circular orbits around the nucleus

• Nucleus consists of protons and neutrons

• Mass of atom is concentrated in the nucleus

• Most of the volume in an atom is void

• A

• B

• C

• D

9) Which philosopher compiled Kindergarten education system ?

• Friedrich Frobel

• Herbert spencer

• John Dewey

• John Locke

         I.            Energy of the n^th orbit is ………. 

• -1/n²     eV

• +13.6eV/n²    eV

• -13.6 eV     

• -13.6/n²   eV