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Class IX Science: Structure of Atom Notes

10 Questions

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Class IX Science: Structure of Atom Notes

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Questions and Answers

What is the maximum number of electrons that can be present in the outermost orbit?

8 (correct)

What is valency?

The combining capacity of the atoms of an element (correct)

The number of neutrons in an atom

The number of electrons in an atom

The number of protons in an atom

What is the valency of elements having 5 electrons in the valence shell?

3 (correct)

What is the sum of protons and neutrons present in an atom known as?

Mass number Signup and view all the answers

What are isotopes?

Atoms with different mass numbers but same atomic numbers Signup and view all the answers

If an element has 3 electrons in its valence shell, what is its valency?

3 Signup and view all the answers

What is the maximum number of electrons that can be present in the second shell of an atom?

8 Signup and view all the answers

How many protons are present in an atom with atomic number 20?

20 Signup and view all the answers

If an isotope of carbon has a mass number of 14, how many neutrons does it have?

6 Signup and view all the answers

What is the valency of an element with 6 electrons in its valence shell?

-2 Signup and view all the answers