UNIT#02 ATOMIC STRUCTURE Flashcards
The mass of a proton is;
1.6726 x 10^-31 kg
What will be the effect on protons when passes through the electric field?
Deflection towards cathode
Positive rays are produced;
By the bombardment of cathode rays on gas molecules
Pressure in the gas discharge tube was kept;
0.01 torr
Positive rays give flash on
ZnS
The relationship between the energy of a photon of light and its frequency is given by:
Planck’s Quantum Model
The velocity of the photon;
Is independent of wavelength
Plank’s theory says energy is emitted:
In a discontinuous manner
The planks equation is:
E= hν
(v= wavenumber)
Quantum number which is not derived from the Schrodinger wave equation;
Spin
A nodal plane in an orbital is the plane where the electron density is;
Zero
The number of degenerate orbitals in a sub-shell having a sausage shape are;
5
Quantum number values for 3p orbital are;
n=3, l=1
Maximum number of electrons that can be accommodated in the p-subshell
6
Which sub-shell has the highest energy;
n=5, l=3, m=+1
Magnetic quantum number values for the d-subshell are;
5
A p-orbital has ___ energy than the s-orbital of the same principal quantum number
Higher
A p-orbital has ___ energy than the s-orbital of the same principal quantum number
Higher
Which set of the quantum numbers represents the 29th electron of the Cu atom
Need to understand it
The d-orbital which is bi-lobed with a collar is represented as:
dz2
____ is/are isoelectronic with K+
➡P-3
➡S-2
➡Si-4
The atomic number of an element is 26. How many electrons are present in the M-shell of this element in the ground state;
14
The electronic configuration of an element is 1s2, 2s2, 2px1, 2py1, 2pz1. This represents a/an:
Ground State
The correct electronic configuration of 29Cu is:
xxx
Which one of the following ions has a similar electronic configuration to Ar:
Ti+4
In the electronic configuration of Cu and Cr which of the following is true:
7 electrons in d-orbitals
Which violates Hund’s rule?
Which has the same spin
Which one of the following represents the most stable configuration of three electrons for the ground state of an element in group VA
npx1, npy1, npz1
A specie Z has following electronic configuration 1s2, 2s2, 2p6, 3s2, 3px2, 3py1, 3pz1
What could Z be
S
The total number of lobes in all the orbitals of a d-subshell are;
18
“Two electrons in the same orbital should have opposite spins” according to;
Pauli’s exclusion principle
The e/m value for the canal rays is maximum for:
Hydrogen
(The value of e/m of positive rays is inversely proportional to molar mass)
The maximum number of electrons in a sub-shell is given by;
2(2l + 1)
According to Bohr, the orbits in which electrons revolve around the nucleus are;
Circular
The atomic number of K:
19
A number of protons, electrons and neutrons in Pb+2:
➡82
➡80
➡125
Spin could be:
➡+1/2
➡-1/2
Cancer treatment which radiation use:
Gamma
M-shell contains:
s, p, d
Who discovered neutron:
Chadwick
If electrons are passed in electric and magnetic field then:
Will go straight
Total no. of electrons that can be accommodated in the f-subshell:
14
n + l value for 5d is:
7
A maximum number of electrons in the p-subshell are:
6
Which one has greater mass?
Alpha
Which one has greater mass?
Alpha
A number of electrons in the 3p subshell of Ca?
6
The number of electrons in chloride ion:
18
According to Planck’s quantum theory
➡a body emits energy in quanta
➡a body absorbs energy in quanta
➡emits or absorbs radiations discontinuously
Rydberg’s constant is related to the atomic no. as:
Z2
The magnetic quantum number of s is:
0
Planck’s constant was named after a scientist:
Planck
The probability of finding an electron between s-orbitals is zero. This place is called:
Nodal Plane
Positive rays are also known as:
Canal Rays
Each electron in an atom must have its own unique set of quantum numbers is a statement of:
Pauli exclusion principle
During bond formation, d orbitals split into ____ of orbitals?
2 sets
he e-m values of the positive rays depend on ____ enclosed in a discharge tube
Nature of gas
The lobes of d-orbitals lie between the axis:
First Three
Different atoms of the same elements are called isotopes having different ____ but the same ____ property?
➡Physical
➡Chemical
The maximum probability of finding an electron is at a distance of
0.53nm
Potassium has electronic configuration and becomes an ion by attaining configuration:
2, 8, 8
A total number of electrons that can be accommodated in the f-subshell?
14
A number of electrons in the 3p orbital of Ca?
6
Which has greater energy according to the Auf-bau principle?
7s
Spectrum is the visual display or ___ of component of white light it is passed through a prism
Dispersion
All the three p-orbitals have the same energy in the absence of a magnetic field and are called ____ orbital’s
Degenerated
How do the ‘p’ orbitals have the same energy in the absence of a magnetic field and are called ___ orbital’s
Orientation
Line spectrum of sodium contains ___ coloured lines separated by a definite distance
Two Yellow
Isoelectronic species have the same
Electronic configuration
The equation E = -2.17 x 10^-18 [1/n2] J gives the energy associated with electrons in the nth orbit of the hydrogen atom. Its negative sign shows that the electron is;
Bound by nucleus
The atomic number of potassium
19
Balmer series in H spectrum lies in ___ region
Visible
The azimuthal quantum number is represented by;
l
Which one has more mass?
α- particle
If there are 9 protons, 9 electrons, and 9 neutrons then the atomic mass will be;
18
Which rays are used for the treatment of cancer;
Gamma
Penetration power of orbitals;
s>p>d>f
The azimuthal quantum number depends on:
n
How many maximum no. of electrons are present in an orbital?
2
Which of the following is the correct order of orbital in increasing energy order is:
s
Positively charged particles in the discharge tube were moved;
Cathode
The exact voltage required in gas discharge tube does not depend upon;
Nature of the gas
Consider the following reaction 4 Be + 2He + 6C + 1n.
This reaction is :
➡An exothermic reaction
➡A nuclear reaction
➡An example of artificial radioactivity
Number of electrons, protons and neutrons present in Zn+2 respectively
➡28
➡30
➡36
The nucleus of an atom is made up of 8 protons and 8 neutrons. Which atoms it is;
O
Which rays are more penetrating in nature
γ- rays
A fast moving neutron can eject from nitrogen
α- rays
e/m ratio of cathode rays is ___ than that of canal rays
Greater
The e/m ratio for the positive rays is maximum for;
Hydrogen
Thickness of Gold foil kept:
0.00004 cm
Rutherford bombarded ___ particles in discovery of nucleus
Alpha rays
Which of the following is not unit of wave number;
m-1
An electron makes a transition from energy state E3 to E1 will emit a photon of frequency
ν = (E3 - E1)/h
(v= wavenumber)
Which set of quantum numbers is not possible:
n=3, l=3, s=+1/2
(n>l)
If the value of n=4 what is probable value of l
0,1,2,3
The number of electrons in a shell can be calculated by formula;
2n2
When azimuthal quantum number l=2, then ‘m’ can have value;
5
If the value of n=4 what is probable value of l
0,1,2,3
The atomic number of an element is sixteen. It belongs to period and group number of the periodic table respectively
3,6
When 4 orbital is complete the entering electron goes into;
5d
Which of the following species has more electrons than neutrons;
O-1
Positive rays are produced;
By ionizing the gas
Pressure in gas discharge tube was kept ___ to produce cathode rays
0.01 torr
The nature o cathode rays in discharge tube:
Is independent of the nature of the gas used in discharge tube
Which of the following are not able to ionize the gas:
Neutrons
Which order of mass is correct in ascending order:
e
Which of the following specie has more electrons than neutrons:
O-1
Positive rays give flash on;
ZnS
The wave number of light emitted by a certain source is 2 x 10^6 m-1. The wavelength of this light will be :
500nm
(v= c v ➡Wavenumber)
Which of the following relationship is incorrect;
➡E ∝v❌
➡E ∝v (wavenumber)❌
➡v(wavenumber) = λ ✅
➡E ∝ 1/λ ❌
All of the following were theorized by Bohr in the description of atom except:
Electron continuously radiate energy in the form of radiation in a given orbit
Electronic configuration of species M+2 and its atomic weight is 56, number of neutrons in the nucleus of species M is:
30
Which of the following quantum number is not derived from Schrodinger wave equation:
Spin quantum number
The numebr of orbitals in the 2nd principal quantum number of an atom is;
4
Magnetic quantum number is related to;
Orientation of orbital
