Give the number of neutrons in an atom of the element A g 47 107 .

The atomic number of Ag = 47 The atomic mass of Ag = 107 u The number of neutrons can be calculated as: Neutrons (n) = Mass number−Atomic number n = 107 - 47 = 60 The number of neutrons in an atom of element A g 47 107 is ⇒ 60 .

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

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Number of electrons present in $N^{3 -}$ ion is

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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 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