Question

(i)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 ?
(ii) Which has more number of electrons Na or Na+? Why?
(iii) Name the isotope used to treat (a) Goitre (b) Cancer.​

Answer 1

Answer:

1 atomic energy

2 nacho2

3 cancer

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