Welcome to your Ncert - class 9- science - Chapter 4 – Structure of the Atom 2
Bohr's theory can be applied to determine the?
The presence of electrons outside the nucleus and nucleus at the centre of the atom was suggested by:
The expression for Bohr's radius of an atom is
Neutron is a fundamental particle carrying:
Goldsteins experiments which involved passing high voltage electricity through gases at very low pressure resulted in the discovery of:
The sum of number of protons and number of neutrons present in the nucleus of an atom is called its
Which of the following is not a correct statement according to Rutherford's atomic model?
The ratio of the radii of the first three Bohr orbits is:
The radius of the first Bohr orbit of hydrogen atom is
Which one of the following is considered as the main postulate of Bohr's model of atom
How many sub-atomic particles are present in an α- particle used in Rutherford's scattering experiment?
The nucleus of helium contains
The introduction of a neutron into the nuclear composition of an atom would lead to a change in:
If an electron moves away from nucleus, its potential energy:
Which of the following statements about Rutherford’s model of atom are correct?
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