Description : How many of the following are possible: 1p, 2s, 3p, 3f, 3d.
Last Answer : Ans.2s , 3p & 3d are possible.
Description : How many quantum numbers are needed to designate an orbital?
Last Answer : Ans.Three quantum numbers.
Description : Why is s-orbital orbital considered non directional while p-orbital directional?
Last Answer : Ans. Electron density in s-orbital is equal in all direction while it dumble shaped along one axis in p- orbitals.
Description : What accounts for the stability of an electron in multi-electron atom?
Last Answer : Ans. i.The angular momentum of an electron is integral multiple of h/2ח ii. The symmetrical electron density of an orbit. iii.The maximum transition energy of an orbital.
Description : `1s^(2)2s^(2)2p^(6)` is the electron configuration of
Last Answer : `1s^(2)2s^(2)2p^(6)` is the electron configuration of A. Nitrogen B. Boron C. Argon D. Neon
Description : What are the values of the orbital angular momentum of an electron in the orbitals `1s,3s,3d` and `2p`:- (a). `0,0sqrt(6h),sqrt(2h)`(b). `1,1sqrt(4h),
Last Answer : What are the values of the orbital angular momentum of an electron in the orbitals `1s,3s,3d` and `2p`:- (a). `0 ... (3)ħ` D. `0,0,sqrt(20)ħ,sqrt(6)ħ`
Description : What is Aufbau’s principle? How it helps to fill electrons in an atom in different orbitals?
Last Answer : Ans Electrons are filled in orbitals of an atom according to increasing energies which is in accordance to (n+l) values of electrons. If (n+l )values are same the electron goes to orbital having lower value of n.
Description : What do you mean by Pauli’e exclusive principle? What is its significance?
Last Answer : Ans No two electrons will have same set of all q.no. If n,l,m are same i.e. same orbital ‘s’ will be differ. It shows that all electrons have a definite place in an atom or their own identity.
Description : What is Hund’s rule of maximum multiplicity? What is its significance?
Last Answer : Ans Pairing of electrons in an orbital takes place only when all orbitals of same sub-shell become singly occupied. It helps to equalize energy of a sub-shell
Description : Explain the significance of spin quantum number.
Last Answer : Ans.The direction of spinning of an electron in an orbit as well as the net magnetic moment of an orbital.
Description : Tell what would happen to the stability of an atom, with atomic number higher than18, if the aufbau principle was not introduced.
Last Answer : Ans. We cannot find out the exact reason of stability of an atom & why they should have filled inner orbits before outermost shell.
Description : Explain why half-filled orbitals have extra stability.
Last Answer : Ans. It has symmetrical electron density as well as greater exchange energy.
Description : Explain the significance of Azimuthal quantum number.
Last Answer : Ans. It refers as sub-energy level of an atom.
Description : “In reality all the s-orbitals are spherically symmetric.” What does this represent?
Last Answer : Ans. The probable density of an electron in s-orbital is equally distributed at all coordinates in space.
Description : Find the number of radial and angular nodes in 3d subshell?
Last Answer : Ans. Zero-angular node as well as radial nodes.
Description : How many maximum 3s electrons can have magnetic spin quantum number -1/2?
Last Answer : Ans. 1 electrons.
Description : What are different types of quantum numbers , write them with their symbols ?
Last Answer : Ans. 1.Principal Quantum Numbers (n) 2.Azimuthal Quantum Numbers(l) 3.Magnetic Quantum Numbers (m) 4.Spin Quantum Numbers(s)
Description : Define Pauli’s exclusion principle ?
Last Answer : Ans. No two electrons in an atom can have same set ofall four quantum numbers. If three are same one Quantum number must have different value.
Description : Give the points of Rutherford Model.
Last Answer : Ans. 1. Atom is neutral. 2.Whole mass is concentrated in nucleus. 3.Electrons are revolving in orbits.
Description : Write two properties which cannot be explain by wave nature of radiation
Last Answer : Ans. 1.Photo electric effect 2. Black Body radiation
Description : Write the draw back of Rutherford Atomic Model.
Last Answer : Ans (1). He was unable to explain the stability of Atom. (2). He could not explain the line spectrum.
Description : Why; e/m value is not constant for canal rays ?
Last Answer : Ans. Mass of particles of cathode rays is not constant.
Description : What is threshold frequency?
Last Answer : Ans –The minimum frequency required to eject out electron from an atom.
Description : Name the spectral series which appear in the region of electromagnetic spectrum. (a) Visible region (b) UV region (c) Far IR region
Last Answer : Ans: (a) Balmer Series (b) Lymen Series (c) Pfund Series
Description : What is the difference between Quantum and photon?
Last Answer : Ans. The smallest packet of Energy of any radiation is called as Quantum and that of Light is known as Photon.
Description : State Heisenberg Uncertainty Principle.
Last Answer : Ans. It is impossible to determine the exact position & exact momentum or velocity of microscopic particle.
Description : Which of the following corresponds to the configuration `1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)` ?
Last Answer : Which of the following corresponds to the configuration `1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)` ? A. He B. Na C. Mg D. Ar
Description : What is 2s and 2p?
Last Answer : What is the answer ?
Description : According to Bohr's theory of hydrogen atom, the angular momentum of the electron in the fourth orbit is given by (a) h/2p (b) 4h/p (c) h/p (d) 2h/p
Last Answer : Ans:(d)
Description : The azimuthal quantum number determines the: w) spin of an electron x) shape of an orbital y) size of an orbital z) energy of an orbital
Last Answer : ANSWER: X -- SHAPE OF AN ORBITAL
Description : The orbital angular momemtum quantum number indicates which one of the following? w) the average distance of the electrons from the nucleus x) the direction of spin of the electron y) the shape of the orbital z) the position about the three axes in space of the orbital
Last Answer : ANSWER: Y -- THE SHAPE OF THE ORBITAL
Description : Which quantum number indicates the shape of the orbital in which the electron moves?
Last Answer : ANSWER: B -- SPIN QUANTUM NUMBER
Description : Which of the following indicates the shape of the orbital in which the electron moves? w) principal quantum number x) spin quantum number y) angular momentum quantum number z) none of these
Last Answer : ANSWER: Y -- ANGULAR MOMENTUM QUANTUM NUMBER
Description : When considering electron orbitals, which orbital is generally considered spherical?
Last Answer : ANSWER: S ORBITAL
Description : Which one of the following statements is WRONG? (A) A singlet or triplet state may result when one of the electrons from the HOMO is excited to higher energy levels (B) In an ... the electron from the singlet excited state returns to ground state, the molecule always shows fluorescence phenomenon
Last Answer : (C) Triplet excited state is more stable than the singlet excited state
Description : The energy required to completely remove an electron from the first Bohr orbit is called a) excited energy b) ionization energy c) accelerated energy d) orbital energy
Last Answer : b) ionization energy
Description : Ionisation energy of nitrogen is greater than that of oxygen because nitrogen has – (1) high bond dissociation energy (2) smaller atomic radius (3) stable half filled 2p sub level (4) high nuclear charge
Last Answer : (3) stable half filled 2p sub level Explanation: Ionization energy is a measure of the ease in which atoms lose electrons and become positive ions.
Description : Ionisation energy of nitrogen is greater than that of oxygen because nitrogen has (1) high bond dissociation energy (2) smaller atomic radius (3) stable half filled 2p sub level (4) high nuclear charge
Last Answer : stable half filled 2p sub level
Description : The orbital angular momentum of 3p electron is :-
Last Answer : The orbital angular momentum of 3p electron is :- A. `sqrt3 h` B. `sqrt6 h` C. zero D. `sqrt2(h)/(2pi)`
Description : What Molecular orbital interactions are not possible because the atomic orbitals have overlapping electron densities.?
Last Answer : Need answer
Description : The maximum electron capacity of any orbital is (a) 2 (b) 6 (c) 14 (d) Cannot be determined unless the principal quantum number is known
Last Answer : Ans:(a)
Description : Which of the two types of electron motion (orbital movement and electron spin) is more important in the explanation of magnetism?
Last Answer : Electron spin.
Description : Orbital magnetic moment of an electron, in an atom, is of the order of (a) 0.1 Bohr magneton (b) 1.0 Bohr magneton (c) 10 Bohr magneton (d) 100 Bohr magneton
Last Answer : Orbital magnetic moment of an electron, in an atom, is of the order of 1.0 Bohr magneton
Description : Which is the best tablet PC: HP 2p or Lenovo X61?
Last Answer : I don’t know much about the specifics of those models, but I would choose a Leonovo in a heartbeat. I know a lot of people who cried when IBM sold the Thinkpad line to Leonovo, but as far as I know the quality is still the same.
Description : If a circular sheet of perimeter 2πr touching each side of a given quadrilateral sheet of perimeter 2p -Maths 9th
Last Answer : Let ABCD be the quadrilateral from which a circular sheet is cut off touching each side of the quadrilateral. Also, given AB + BC + CD + DA = 2p ...(i) Circumference of the circle = 2πr ⇒ ... = pr.∴ Required remaining area = Area of quadrilateral - Area of circle = pr - πr2 = r(p - πr).
Description : If `(2p+5q)/(2r+5s) = (4p-3q)/(4r-3s)`, then find the relation between p, q, r and s.
Last Answer : If `(2p+5q)/(2r+5s) = (4p-3q)/(4r-3s)`, then find the relation between p, q, r and s.
Description : Find `(x+2p)/(x-2p) +(x+2q)/(x-2q),"when x" = (4pq)/(p+q)`.
Last Answer : Find `(x+2p)/(x-2p) +(x+2q)/(x-2q),"when x" = (4pq)/(p+q)`.
Description : What is the answer to (-6p-8)-(2p-6)?
Last Answer : the answer isn't the answer it equals the question!!!!!andthat's true!!
Description : What is 2p times 3q times 5r equals?
Last Answer : It can be simplified to 30pqr which means the same as the giventerms
Description : What is 7p plus 6q-2p plus q?
Last Answer : 5p-7q