( Each question carries 2 marks) 7. Compare the properties of electrons,protons and neutrons.
8. Find the average atomic mass of chlorine atom if chlorine occurs in nature in two isotopic forms with masses 35u and 37u in the ratio 3:1 that is 75% and 25% respectively.
9. Explain isotopes and isobars with the help of examples.
10. Which has more number of electrons- Na' or Na?why?
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Explanation:
7.Properties of electon ,proton and electron.
Electron = These are negatively charged particles.
Proton = These are positively charged particles.
Neutrons =They have no charge.
9.Isotopes =same atomic number but different mass number .
for example = C_ 12 ,C_14
Isobars = same mass number but different atomic number.
for example = 18(argon)=40, 20(calcium) =40.
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