O 8 16 and N 7 16 are isobars. Use this example to explain isobars.

O 8 16 and N 7 16 are isobars. That is, the given elements have different atomic number, but they have the same mass number. They differ in number of protons but the sum of the number of protons and neutrons in isobars will be same.

O 8 16 and N 7 16 are isobars. Use this example to explain isobars.

O 8 16 and N 7 16 are isobars. That is, the given elements have different atomic number, but they have the same mass number. They differ in number of protons but the sum of the number of protons and neutrons in isobars will be same.

Find out the number of valence electrons in O 8 16 and N 7 14 .

In O 8 16 , the atomic number is 8 . That is, it has eight electrons in it. Its electronic configuration is 2 , 6 . Valence electrons are the number of electrons present in the outermost shell of an atom. Therefore, O 8 16 has six valence electrons in it. In N 7 14 , the atomic number is 7 . That is, it has seven electrons in it. Its electronic configuration is 2 , 5 . Therefore, N 7 14 has five valence electrons in its outermost shell.

E M B I B E

Science (Theory & Practical) Class-9>Chapter 3 - Atomic Structure>Exercise>Q 4

MEDIUM

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IMPORTANT

Earn 100

${}_{8}^{16}O$ and ${}_{7}^{16}N$ are isobars. Use this example to explain isobars.

Important Questions on Atomic Structure

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IMPORTANT

Science (Theory & Practical) Class-9>Chapter 3 - Atomic Structure>Exercise>Q 5

Bromine-

79

and bromine-

81

are found in nature in the ratios

50.69

and

49.31

. What will be the average atomic weight of bromine?

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IMPORTANT

Science (Theory & Practical) Class-9>Chapter 3 - Atomic Structure>Exercise>Q 6

Find out the number of valence electrons in

{}_{8}^{16}O

and

{}_{7}^{14}N

.

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IMPORTANT

Science (Theory & Practical) Class-9>Chapter 3 - Atomic Structure>Exercise>Q 7

Describe Bohr's atomic model.

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IMPORTANT

Science (Theory & Practical) Class-9>Chapter 3 - Atomic Structure>Exercise>Q 8

Apart from oxygen-

16

, oxygen-

17

and oxygen-

18

are also known to exist in nature. Are these atoms isotopes or isobars? Explain.

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IMPORTANT

Science (Theory & Practical) Class-9>Chapter 3 - Atomic Structure>Exercise>Q 9

Explain Dalton's atomic theory. What are its limitations?

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IMPORTANT

Science (Theory & Practical) Class-9>Chapter 3 - Atomic Structure>Exercise>Q 10

What was the alpha particle scattering experiment carried out by Rutherford? What conclusions did he draw from this experiment regarding the structure of an atom?

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IMPORTANT

Science (Theory & Practical) Class-9>Chapter 3 - Atomic Structure>Exercise>Q 11

Write the rules proposed for electron distribution under the Bohr-Bury scheme. Use the rules to write the electronic configuration of given atoms. Also, give the number of neutrons present in each atom.

${}_{9}^{19}F, {}_{12}^{24}{Mg}, {}_{14}^{28}{Si}, {}_{15}^{31}P, {}_{17}^{35}{Cl}$