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(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)

Are their chemical properties same or different ? Explain and support your answer. (c) Which has more number of electrons Na or Na1? Why ?


(c) Na because Na1 will give one electron to become stable and hence the electron will remain in Na1 are 10
a) they are isobars
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