IV.
Think and answer: -
1. Draw the orbit structure of MgCl,
2. The atom of an element is made up of 18 protons, 22 neutrons & 18 electrons what are
its atomic number and mass number
3. What do you mean by periodicity of properties of elements?
4. A, B & C are the elements of a dobereiner's triad if atomic mass of 'A' is 39 and that
of 'C' is 45 what should be the atomic mass of B?
5. a) Why hydrogen is considered in group IA as well in group VII A
b) Write the electron dot structure of an element “oxygen
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