class 9 (Structure of atom)

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

Which of the following model describes the structure of an atom proposed by

Thompson?

• 
• 
• 
• 

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NGSS.MS-PS1-1

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.

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NGSS.MS-PS1-1

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 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

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NGSS.HS-PS1-1

The atomic number of sodium (Na) is 11. How many valence electrons does sodium

have?

• (a) 1

• b) 2

• (c) 7

• (d) 8

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

Which elements have a valency of 2?

• (a) Be and Si

• (b) Si and Cl

• (c) Be and O

• (d) Cl and O

Which element would be inert in nature?

• (a) Element with 2 electrons

• (b) Element with 9 electrons

• (c) Element with 12 electrons

• (d) Element with 20 electrons

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

The image shows the scientific notation of sodium. What is the atomic mass of Na?

• (a)11

• (b)12

• (c)23

• (d)34