All In One SCIENCE CBSE Class IX>Chapter 4 - Structure of the Atom>CHAPTER EXERCISE>Q 2

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How many neutrons are present in the nucleus of a hydrogen atom?

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Important Questions on Structure of the Atom

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All In One SCIENCE CBSE Class IX>Chapter 4 - Structure of the Atom>CHAPTER EXERCISE>Q 3

Which of the following correctly represent the electronic distribution in the

M g

atom?

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All In One SCIENCE CBSE Class IX>Chapter 4 - Structure of the Atom>CHAPTER EXERCISE>Q 4

Number of electrons present in

N^{3 -}

ion is

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All In One SCIENCE CBSE Class IX>Chapter 4 - Structure of the Atom>CHAPTER EXERCISE>Q 5

The number of electrons in an element $X$ is $15$ and the number of neutrons is $16 .$ Which of the following is the correct representation of the element?

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All In One SCIENCE CBSE Class IX>Chapter 4 - Structure of the Atom>CHAPTER EXERCISE>Q 6

In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R).
Assertion: The valency of an atom of fluorine is

7 .

Reason: The number of electrons present in the outermost shell of an atom is known as the valence electrons.
Mark the correct choice as:

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All In One SCIENCE CBSE Class IX>Chapter 4 - Structure of the Atom>CHAPTER EXERCISE>Q 7

In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R).
Assertion: Bohr's orbits are called stationary orbits.
Reason: Electrons remain stationary in these orbits for some time.
Mark the correct choice as:

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All In One SCIENCE CBSE Class IX>Chapter 4 - Structure of the Atom>CHAPTER EXERCISE>Q 8

In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R).
Assertion According to Bohr's model, the orbits of an atom are also called energy levels.
Reason Orbits are the spheres containing the definite value of energy.
Mark the correct choice as:

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All In One SCIENCE CBSE Class IX>Chapter 4 - Structure of the Atom>CHAPTER EXERCISE>Q 9

Does the nucleus contain neutrons also?

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All In One SCIENCE CBSE Class IX>Chapter 4 - Structure of the Atom>CHAPTER EXERCISE>Q 10

An element