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ICSE Class 9 Chemistry Question 18 of 24

Model Question Paper — 1 — Question 16

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Question

Question 6(d)

(i) What do you understand by the term 'isotopes'?

(ii) Why do isotopes of an element possess identical chemical properties ?

(iii) Name the isotope of hydrogen which do not have a neutron in it.

Answer

(a) The atoms of the same element, having same atomic number (Z), but different mass number (A), are called isotopes.

​(ii) Chemical properties of isotopes of the same element are similar because chemical properties are dependent on the electronic configuration of an atom. As Isotopes have same atomic number so they have same number of electrons and hence same electronic configuration.

(iii) Protium (11H).