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Worksheetsstructure of atom
Total questions: 10
Worksheet time: 5mins
Which element was chosen as the standard reference for measuring atomic masses
Carbon
Oxygen
Carbon-12 isotope
None of these
What is u
Uniform mass
Used mass
Unified mass
Unused mass
The image shows the scientific notation of sodium. What is the atomic mass of Na?
(a)11
(b)12
(c)23
(d)34
The atomic number of Sulphur (S) is 16. Identify the number of electrons in each shell of
Sulphur.
(a)2, 8, 6
(b)2, 8, 8
(c)2, 2, 8, 4
(d)2, 4, 8, 2
The atomic number of sodium (Na) is 11. How many valence electrons does sodium
have?
(a) 1
b) 2
(c) 7
(d) 8
Which of the following CAN NOT be the maximum number of electrons in a given shell
according to the Bohr & Bury’s rule for electronic configuration:
(a) 2
(b) 6
(c) 18
(d) 32
Rutherford conducted an experiment to study the structure of atom. He passed
positively charged alpha particles through a thin gold foil. He studied the angle of deflection
of the alpha particles. He noticed that most of the alpha particles passed through the gold
foil without any deflection. What can be concluded from the observation?
(a) Most of the space in an atom is empty.
(b) Atoms have electrons, protons, and neutrons.
(c) The nucleus of the atom is situated at the center.
(d) Atoms do not have positively charged particles.
Which of the following is NOT the correct explanation of Thompson’s atomic model?
(a)The atom is positively charged sphere.
(b)Electrons are embedded in the positive sphere.
(c)The positive and negative charges balance each other.
(d)Protons and neutrons are embedded in the center of the sphere.
Which of the following model describes the structure of an atom proposed by
Thompson?
How the sub atomic particles like Proton is different from electron?
(a)An electron is much heavier than a proton.
(b)An electron carries more charge than a proton.
(c) A proton can be easily removed from the atom, but not an electron.
(d) A proton is positively charged, whereas an electron is negatively charged
