Worksheetsstructure of atom
Total questions: 42
Worksheet time: 22mins
In Thomson's plum pudding model, the plums represent
protons
neutrons
the nucleus
electrons
In Rutherford's famous "Gold Foil" experiment, some particles passed through the foil, some were deflected, and some were bounced straight back. This observation made Rutherford conclude
gold atoms have a solid nucleus
gold atoms can conduct electricity
gold atoms are denser than other metals
gold's elections orbit the nucleus at definite distances from the center
Who discovered the Neutron?
James Chadwick
Niels Bohr
John Dalton
Ernest Rutherford
What was the name of J.J Thomsons' model of atomic structure.
Electron Cloud Model
Electron Sea Model
Water melon Model
Bohr Model
Identify an element with tendency to gain electrons, having three shells and valency 3
Nitrogen
Alumimium
Boron
Phosphorous
Identify an element with tendency to lose electrons, having three shells and valency 1.
Potassium
Sodium
Lithium
Chlorine
Identify an element with two shells and five electrons in the valence shell.
Nitrogen
Oxygen
Phosphorous
Silicon
An element has 16 protons and 32 nucleons in its nucleus, how many neutrons are present in the atom?
8
16
18
48
What is its valency?
(a)Number of electrons lost during a bond formation
(b) Number of electrons gained during a bond formation
(c) Number of electrons shared during a bond formation
All three options:(a),(b) and (c )
An element has 16 protons. The number of electrons present in the valence shell of this element are_________.
6
2
8
4
HOW MANY ELECTRONS ARE PRESENT IN OXIDE ION?
8
9
10
11
ISOTOPE OF FOLLOWING ELEMENT IS USED IN TREATMENT OF GOITRE
COBALT
IODINE
URANIUM
MAGNESIUM
ISOTOPES OF ELEMENTS HAVE SAME
PHYSICAL PROPERTIES
CHEMICAL PROPERTIES
MASS NO
NO OF NEUTRONS
ELECTRONIC CONFIGURATION OF CALCIUM IS
2,8,8,2
2,8,9
2,8,7,3,
2,7,7,4,
FIND OUT THE ATOMIC NO OF ELEMENT IF ITS BOTH K AND L SHELLS ARE COMPLETELY FULL:
11
20
12
10
AN ATOM HAS MASS NUMBER 37 AND ATOMIC NO 17.FIND THE NO OF PROTONS
21
22
17
20
K SHELL-2, L SHELL- 7, M SHELL-2 IS ELECTRONIC CONFIGURATION OF:
HYDROGEN
SODIUM
MAGNESIUM
NONE
ELECTRONS REVOLVE IN DISCRETE ENERGY SHELLS
THIS WAS PROPOSED BY
NEIL BOHR
ANTOINNE LAVOISIER
ROBERT BOYLE
RUTHERFORD
ATOM HAS A POSITIVELY CHARGED NUCLEUS
THIS WAS PROPOSED BY SCIENTIST:
J.J.THOMSON
E.GOLDSTEIN
RUTHERFORD
NEILS BOHR
WHO DISCOVERED PROTONS?
E.GOLDSTEIN
J.J.THOMSON
RUTHERFORD
CHADWIK
WHO DISCOVERED ELECTRONS
J.J.THOMSON
E.GOLDSTEIN
RUTHERFORD
CHADWIK
What is the atomicity of oxygen?
16
2
8
6
What is the number of nucleons in an atom of boron?
5
6
16
11
How many protons are there in an atom of aluminium?
27
13
14
17
What is the atomic number of chlorine?
35
18
7
17
For principal quantum number n=4, the total number of orbitals having l=3 is
3
5
7
9
The quantum of light is
photon
neutron
electron
proton
Which of the following has the maximum number of unpaired d-electrons?
Ni3+
Cu+
Zn2+
Fe2+
Uncertainity in the position of an electron (mass= 9.1 x 10-31 kg) moving with a velocity 300 m/s, accurate upto 0.001% will be
5.76 x 10-2 m
1.92 x 10-2 m
3.84 x 10-2 m
19.2 x 10-2 m
Which of the following is isoelectronic with Ca2+
Fe3+
S2-
Mg2+
P
The sub-shell with n=6, l=2 can accomodate a maximum of
10 electrons
12 electrons
36 electrons
72 electrons
Which of the following radiations has largest energy?
λ = 30 nm
λ = 300 pm
ν = 3 x 10-12 s-1
ν = 3 x 10-10 s-1
The energy of an electron in 3rd orbit of hydrogen atom is:
-1311.8 kJ/mol
-82.0 kJ/mol
-145.7 kJ/mol
-327.9 kJ/mol
The radius of first orbit of hydrogen is 0.53 Å. The radius of second orbit would be
1.06 Å
0.26 Å
0.53 Å
2.12 Å
The correct electronic configuration of Cr (Z=24) is
[Ar] 3d 5 4s 1
[Ar] 3d 4 4s 2
[Ar] 3d 9 4s 2
[Ar] 3d 10 4s 1
The probability of finding the electron in a certain space around the nucleus is known as:
Schrödinger's equation
Wavefunction
Orbital
Quantum numbers
What are the possible values of the magnetic quantum number for an electron in a 3p orbital?
-3, -2, -1, 0, +1, +2, +3
-2, -1, 0, +1, +2
-1, 0, +1
0
Which spectra is known as fingerprint spectra?
Continuous emission spectra
Line emission spectra
Absorption spectra
In photoelectric effect, the kinetic energy of the photoelectrons increases linearly with the
Wavelength of incident light
Frequency of incident light
Velocity of incident light
Atomic mass of the element
The correct set of four quantum numbers for the balance electron of rubidium atom
(z=37) is
5, 1, 1, +1/2
6, 0, 0, +1/2
5, 0, 0, +1/2
5, 1, 0, -1/2
