The advantage of expressing electronic configuration is that it gives an idea about ____.
The advantage of expressing electronic configuration in orbital form is that it gives an idea about the chemical behaviour of the elements. The valence shell configuration of the elements predicts the chemical behaviour of the elements.
A ray of ____ light gives a series of coloured bands called spectrum.
A ray of white light gives a series of colored bands called spectrum. Ordinary white light consists of waves with all the wavelengths in the visible range.
Which of the following statement is not correct about the characteristics of cathode rays?
Number of protons,neutrons and electrons in the element 89X231 is
Number of P = number of e =89 and neutrons 231-89=142.
While performing cathode ray experiments, it was observed that there was no passage of electric current under normal conditions. Which of the following can account for this observations?
Which of the following statements do not form a part of Bohr's modelof hydrogen atom?
Uncertainty principle which was given by Hiesenberg and not Bohr's postulate.
According to Bohr’s model, the energy is ____ if the electron moves from lower to higher orbit in a atom.
According to Bohr’s model, the energy is absorbed, if the electron moves from lower to higher orbit in a atom. According to the assumption of Bohr’s model, energy is absorbed if the electron moves from the orbit of lower energy to the orbit of higher energy. If the movement of electron is reversed, energy is emitted.
Which of the following statement about the electron is incorrect?
Rutherford's α-particle dispersion experiment concludes.
All positive iron are deposited at small part.(nucleus of atom)
The total number of electrons that can be accommodated in all the orbitals having principal quantum number 2 and azimuthal quantum number 1 is
n=2 ,1- = 1 means 2p-orbital . Electrons that can be accommodated = 6 as p sub- shell has 3 orbital and each orbital contains 2 electrons.
Planck gave the name ‘quantum’ to the smallest quantity of ____ .
Planck gave the name ‘quantum’ to the smallest quantity of energy that can be emitted or absorbed in the form of electromagnetic radiation. E = hν. Here, h is Planck’s constant and ν is frequency.
Neutrons present in the atom have very little effect on the ____ properties.
Neutrons present in the atom have very little effect on the chemical properties of the atom. All chemical properties of an atom are controlled by the electrons present in the atom.
The stability of half-filled orbitals are due to ____.
The stability of half-filled orbitals are due to symmetrical distribution of electrons and exchange energy. If orbital is in half-filled position, there is a symmetry in the molecule, which leads to more stability of the molecule.
____ particles depend on the nature of the gas while ____are independent of the gas present in the cathode ray tubes.
Positively charged particles depend on the nature of the gas while electrons are independent of the gas present in the cathode ray tubes.
The number of electrons ejected is directly proportional to the ____ of the light .
The number of electrons ejected is directly proportional to the intensity of the light or brightness of the light.
Heisenberg uncertainty principle holds significance only for ____.
Heisenberg uncertainty principle is applicable for microscopic objects. The effect of Heisenberg uncertainty principle is significant only for motion of microscopic objects and it is negligible for macroscopic objects, milligram sized objects and gram sized objects, because Δx * Δv is extremely small and insignificant.
The distribution of electrons in various orbitals is known as ____.
The distribution of electrons in various orbitals is known as electronic configuration of the atom. Distribution of electrons gives configuration to the atom only, not of structure or electronic levels or quantum numbers of the atom.
Which of the following properties of atom, could by
The electron was shown experimentally to have wave properties by
Wave nature of electron was shown by Davission and Germer.Davision and germer demontrated the physical reality of the wave nature of electrons by showing that a beam of electrons could also diffracted by crystals just like light of x-rays.
The ion that is isoelectronic with CO is
We know that ions which have the same number of electrons are isoelectronic. We also know that both CO and CN- have 14 electrons, therefore these are isoelectronic.
Electrons move around the nucleus in circular paths called as ____.
Electrons move around the nucleus in circular paths called as orbits. The nucleus is surrounded by electrons that move around it with very high speeds in circular paths called orbits. It resembles the solar system in which the nucleus plays the role of sun and the electrons that of revolving planets.
The maximum number of electrons that can be accommodated in d-subshell is ____.
The maximum number of electrons that can be accommodated in d-subshell is 10. Two electrons can be accommodated per orbital. Hence, in five d-orbitals, only ten electrons can be accommodated.
The p-orbitals are ____ in shape.
The p-orbitals are dumbbell in shape. The ‘d’-orbitals are double dumbbell in shape.
If the nitrogen atom has electronic configuration 7 it would have energy lower than that of the normal ground state electrons would be closer to the nucleus. Yet 7 is not observed .It violates
Not more than two electrons can be present in same atomic
Which of the following is never true for cathode rays?
Cathode rays are never electromagnetic waves.
Maximum number of electrons in a subshell of an atom is determined by the folowing:
The number of sub shell is (2Ɩ+1).The maximum number of electrons in the sub shell is 2.
The orbitals are called degenerate when
The orbitals which have same energy are called degenerate orbitalseg. Px-py-pz
If travelling at same speeds, which of the following matter waves the shortest wavelength?
"λ = h/mv . For same value of v, larger the value of mass m,shorter is the wavelength, λ . Here,α- particles have the largest mass. Since,alpha particles have the largest mass, they have the shortest wavelength."
The third line of the Balmer series,in the emission specturm of the hydrogen atom, is due to the transition from the
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