CBSE Class 9 Answered
(a) What is the relationship between two elements X and Y whose atomic numbers are 18 and 20 respectively but their mass numbers remain same as 40 ?
(b) Which has more number of electrons Na or Na+? Why?
(c) Name the isotope used to treat (a) Goitre (b) Cancer.
Asked by Topperlearning User | 14 May, 2014, 01:16: PM
Expert Answer
(a) Isobars have same mass numbers and different atomic numbers.
(b) Na contains one electron more than Na+.
The (+) ve charge indicates it has lost one electron.
(c) (i) Isotope of iodine is used in the treatment of goiter.
(ii) Isotope of Cobalt is used in the treatment of cancer.
Answered by | 14 May, 2014, 03:16: PM
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