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......................was the first one to propose a model for the structure of an atom
1. j.j thomson
2. dalton
3. rutherford
4. none of these
Thomson proposed the model of an atom to be similar to that of a ...............
1. curd
2. rice
3. christmas pudding
4. none of these
The negative and positive charges are equal in magnitude. So, the atom as a whole is electrically ...............
1. positive
2. neutral
3. negative
4. none of these
gold foil was about ................ atoms thick.
1. 200
2. 100
3. 1900
4. none of these
α-particles are ,.................-charged helium ion
1. doubly
2. triply
3. quadly
4. none of these
who was known as the ‘Father’ of nuclear physics
1. dalton
2. jj. thomson
3. rutherford
4. none of these
who got the Nobel prize in chemistry in 1908.
1. rutherford
2. j.j thomson
3. dalton
4. none of these
The size of the nucleus is very small as compared to the size of the,...............``
1. atom
2. nucleus
3. matter
4. none of these
orbits or shells are called ............. levels.
1. power
2. volt
3. energy
4. none of these
who discovered another subatomic particle which had no charge and a mass nearly equal to that of a proton. It was eventually named as neutron.
1. rutherford
2. dalton
3. j.j thomson
4. J. Chadwick
an atom of each element has a definite combining capacity, called its ........
1. valent
2. valency
3. valance
4. none of these
" Z " is the symbol of ..............
1. atomic number
2. atomic mass
3. mass number
4. none of these
atomic number is defined as the total number of ................. present in the nucleus of an atom
1. proton
2. neutron
3. electron
4. none of these
protons and neutrons are also called
1. nucleous
2. nucleons
3. nuclei
4. none of these
The...................... is defined as the sum of the total number of protons and neutrons present in the nucleus of an atom.
1. atomic mass
2. atomic number
3. mass number
4. none of these
....................... are defined as the atoms of the same element, having the same atomic number but different mass numbers
1. isotopes
2. isobars
3. atoms
4. none of these
The .................. properties of isotopes are similar but their ...................... properties are different
1. physical , chemical
2. chemical , physical
3. both
4. none of these
Chlorine occurs in nature in .............. isotopic forms
1. one
2. two
3. three
4. four
An isotope of cobalt is used in the treatment of ...................
1. HIV
2. cancer
3. arthritis
4. none of these
An isotope of uranium is used as a fuel in
1. nuclear reactor
2. aeroplane
3. battery
4. none of these
An isotope of iodine is used in the treatment of
1. scurvy
2. elephantasis
3. goiter
4. night blindness
Atoms of different elements with different atomic numbers, which have the same mass number, are known as
1. isobars
2. isotopes
3. isomers
4. none of these
.......................alpha-particle scattering experiment led to the discovery of the atomic nucleus
1. dalton
2. rutherford
3. j.j thomson
4. bhor
...................... model of the atom was more successful
1. Dalton
2. Rutherford
3. Neils Bohr’s
4. none of these
An outermost-shell, which had eight electrons was said to possess an
1. noctet
2. octet
3. decate
4. none of these
atomic number of argon is
1. 16
2. 17
3. 18
4. 19
The maximum number of electrons that can be accommodated in the outermost orbit is
1. 5
2. 6
3. 7
4. 8
The size of the nucleus is very .................. as compared to the size of the atom
1. large
2. moderate
3. small
4. none of these
symbol of potassium is
1. P
2. k
3. PO
4. KO
Shells of an atom are designated as
1. a, b, c, d,
2. K,L,M,N
3. P,Q ,R ,S
4. none of these

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