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ICSE Class 8 Chemistry Question 11 of 23

Atomic Structure — Question 15

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Question

Question 10

State the mass number, the atomic number, number of neutrons and electronic configuration of the following atoms.

(a) 12C6

(b) 16O8

(c) 19F9

(d) 20Ne10

(e) 27Al13

(f) 35Cl17

Also, draw atomic diagrams for each of them.

Answer

(a) 12C6

Atomic number: 6

Mass number: 12

Number of neutrons: 12 - 6 = 6

Electronic configuration: 2, 4

Atomic diagram:

Carbon atomic structure. Atomic Structure, Concise Chemistry Solutions ICSE Class 8

(b) 16O8

Atomic number: 8

Mass number: 16

Number of neutrons: 16 - 8 = 8

Electronic configuration: 2, 6

Atomic diagram:

Oxygen atomic structure. Atomic Structure, Concise Chemistry Solutions ICSE Class 8.

(c) 19F9

Atomic number: 9

Mass number: 19

Number of neutrons: 19 - 9 = 10

Electronic configuration: 2, 7

Atomic diagram:

Fluorine atomic structure. Atomic Structure, Concise Chemistry Solutions ICSE Class 8.

(d) 20Ne10

Atomic number: 10

Mass number: 20

Number of neutrons: 20 - 10 = 10

Electronic configuration: 2,8

Atomic diagram:

Neon atomic structure. Atomic Structure, Concise Chemistry Solutions ICSE Class 8.

(e) 27Al13

Atomic number: 13

Mass number: 27

Number of neutrons: 27 - 13 = 14

Electronic configuration: 2, 8, 3

Atomic diagram:

Aluminium atomic structure. Atomic Structure, Concise Chemistry Solutions ICSE Class 8.

(f) 35Cl17

Atomic number: 17

Mass number: 35

Number of neutrons: 35 - 17 = 18

Electronic configuration: 2, 8, 7

Atomic diagram:

Chlorine atomic structure. Atomic Structure, Concise Chemistry Solutions ICSE Class 8.