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electron occupies the available orbital singly before pairing in any one orbital occurs it is1 paulis exclusion principle2 hunds rule3 heisenbergs
existence of positively charged nucleus was established by1 positive ray analysis 2 alpha -ray scattering experiments x-ray analysis4
bohr model of an atom could not account for1 emission spectrum 2 absorption spectrum 3 line spectrum of hydrogen 4fine
energy of orbit1 increases as we move away from nucleus 2 decreases as we move away from nucleus 3 remains same as we move away from
the spectrum of he is expected to be similar to 1 h 2
which one of the following is not the characteristic of plancks quantum theory of radiation1the energy is not absorbed or emitted in whole number or
when beryllium is bombarded with alpha -particles extremely penetrating radiations which cannot be deflected by electrical or magnetic field
when an electron jumps from l to k shell1 energy is absorbed 2 energy is released 3 energy is sometimes absorbed and sometimes
when alpha -particles are sent through a thin metal foil most of them go straight through the foil because one or more are correct1 alpha
positronium consists of an electron and a positron a particle which has the same mass as an electron but opposite charge orbiting round their common
when atoms are bombarded with alpha particles only a few in n others pass out undeflected this is because1 the nucleus occupies much smaller
bohrs model can explain1 the spectrum of hydrogen atom only 2 spectrum of atom or ion containing one electron only 3 the spectrum of
rutherfords alpha particle scattering experiment eventually led to the conclusion that1the point of impact with matter can be precisely
rutherfords scattering experiment is related to the size of the1 nucleus 2 atom 3
rutherfords experiment on scattering of particles showed for the first time that the atom has1 electrons 2
which of the following is always a whole number1 atomic weight 2 atomic radii 3
number of neutrons in heavy hydrogen atom is1 0 2 1 3 2 4 3ans
the nitrogen atom has 7 protons and 7 electrons the nitride ion n3- will have1 7 protons and 10 electrons 2 4 protons and 7 electrons 3 4
six protons are found in the nucleus of1 boron 2 lithium 3 carbon 4 heliumans
which among the following species have the same number of electrons in its outermost as well as penultimate shell1
the compound in which cation is isoelectronic with anion is 1 nacl 2 csf
the nucleus of an element contains 9 protons its valency would be1 1 2 3 3
the atomic number of an element is 35 what is the total number of electrons present in all the p-orbitals of the ground state atom of that element1
tritium is the isotope of1 hydrogen 2 oxygen 3
the number of neutron in tritium is1 1 2 2 4 3 4 0ans