Chlorine is an element of atomic number 17 . It is a mixture of isotopes having mass numbers of 35 and 37 . Complete the given table: Element Number of electrons Number of protons Number of neutrons Cl 17 35 ___ ___ ___ Cl 17 37 ___ ___ ___

Element Number of electrons Number of protons Number of neutrons Cl 17 35 17 e - 17 p 18 n Cl 17 37 17 e - 17 p 20 n Cl 17 35 , this isotope of chlorine atom has atomic number 17 and mass number 35 . Cl 17 37 , this isotope of chlorine has atomic number 17 and mass number 37 . Atomic number is the number of protons present in the nucleus of an atom. Mass number represents the total number of protons and neutrons in an atom.

E M B I B E

S. Chand's ICSE CHEMISTRY Book -1 CLASS- 9>Chapter 4 - Atomic Structure>Questions>Q 17

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Chlorine is an element of atomic number $17$ . It is a mixture of isotopes having mass numbers of $35$ and $37$ .

What is meant by the term atomic number?

Important Questions on Atomic Structure

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S. Chand's ICSE CHEMISTRY Book -1 CLASS- 9>Chapter 4 - Atomic Structure>Questions>Q 17

Chlorine is an element of atomic number $17$ . It is a mixture of isotopes having mass numbers of $35$ and $37$ .

Write down the electronic configuration of the chlorine atom.

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S. Chand's ICSE CHEMISTRY Book -1 CLASS- 9>Chapter 4 - Atomic Structure>Questions>Q 17

Chlorine is an element of atomic number $17$ . It is a mixture of isotopes having mass numbers of $35$ and $37$ .

Complete the given table:

Element	Number of electrons	Number of protons	Number of neutrons
${}_{17}^{35}{Cl}$	___	___	___
${}_{17}^{37}{Cl}$	___	___	___

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S. Chand's ICSE CHEMISTRY Book -1 CLASS- 9>Chapter 4 - Atomic Structure>Questions>Q 18

Five atoms are labelled A to E.

Atoms	Mass number	Atomic number
A	$40$	$20$
B	$19$	$9$
C	$7$	$3$
D	$16$	$8$
E	$14$	$7$

(a) Which of these above mentioned atoms,

(i) contains $7$ protons?
(ii) has an electronic configuration $2, 7$ ?

(b) Write down the formula of the compound formed by atoms $C$ and $D$ .

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S. Chand's ICSE CHEMISTRY Book -1 CLASS- 9>Chapter 4 - Atomic Structure>Questions>Q 19

The atom of aluminium is represented by

{}_{13}^{27}{Al}

. Write down the number of (i) electrons (ii) protons (iii) neutrons and (iv) the arrangement of electrons in the different orbit or shells in one atom of aluminium.

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S. Chand's ICSE CHEMISTRY Book -1 CLASS- 9>Chapter 4 - Atomic Structure>Questions>Q 19

Name the element which does not contain neutrons in its nucleus.

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S. Chand's ICSE CHEMISTRY Book -1 CLASS- 9>Chapter 4 - Atomic Structure>Questions>Q 19

Give two differences between sodium atom and sodium ion.

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