Question 7 (a) Give a general idea of Dobernier triads with one example.
(b) State Mendeleev's Periodic Law and give its defects.
(c) An element X has atomic number 17 and has mass no. 37.
Draw its orbital structure and state the position of X in the periodic-table.
(d) (i) Write the molecular formula of magnesium phosphate.
(ii) Calculate the molecular mass of this compound.
(iii) What is the percentage of phosphorus in magnesium phosphate ?
[At. mass : Mg = 24, P = 31, 0 = 16]
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