CBSE Class 9 Answered
(a) Give one important application of an isotope of Cobalt.
(b) Elements from A to E have in them the distribution of e, p and n as follows.
Elements
Electrons
Neutrons
Protons
A
4
4
3
B
8
9
9
C
18
22
18
D
17
20
17
E
17
18
17
Making use of this data, find:
(i) cation
(ii) anion
(iii) a pair of isotopes
(iv) an atom of noble gas
Asked by Topperlearning User | 14 May, 2014, 07:08: AM
Expert Answer
(a) An isotope of cobalt Co - 60 is used in the treatment of cancer.
(b) (i) cation = B (no. of protons > no. of electrons)
(ii) anion = A (no. of electrons > no. of protons)
(iii) a pair of isotopes = D and E (same atomic no. but different mass no.)
(iv) an atom of noble gas = C (8 electrons in valence shell)
Answered by | 14 May, 2014, 09:08: AM
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