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ICSE Class 9 Chemistry Question 19 of 39

Atomic Structure and Chemical Bonding — Question 31

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31
Question

Question 17

(a) What is meant by 'atomic number of an element'?

(b) Complete the table given below:

  No of protonsNo of electronsNo of neutronsAtomic numberMass number
3517Cl     
3717Cl     

(c) Write down the electronic configuration of

(i) Chlorine atom

(ii) Chloride ion

Answer

(a) Atomic number of an element is the number of:

  • electrons present in its neutral atom.
  • protons present in the nucleus of its atom.
  • positive charge in the nucleus of its atom.
  • it is denoted by Z.

(b) Complete the table given below:

  No of protonsNo of electronsNo of neutronsAtomic numberMass number
3517Cl1717181735
3717Cl1717201737

(c) Write down the electronic configuration of

(i) Chlorine atom — 2, 8, 7

(ii) Chloride ion — 2, 8, 8