Question

7. Are mass number and atomic mass of an element equal in all respects? (1)
8. What are ions? What are its two types? (1)
9. The element aluminium istvritten by the symbol ? Al. Write the number o
electrons and neutrons present in it. (1)
CS
10. Out of C-12 and C-14 isotopes of carbon, which is of radioactive nature? (1)
11. Which of the tw
emically more reactive : element X with atomic
mber 172 (3)
video
or element Y
12. How do you k
us is very small as compared to the size of atom
13. The average atomic...ss of a sample of an element X is 16.2 u. What are the
percentages of isotopes 16 X and je
18 X? (3)​

Answer 1

Answer:

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