Question

an element X is placed in the third group and third Period of the modern periodic table answer the following questions stating reason for your answer in each case (i) write the electronic configuration of element X (ii) write the formula of the compound formed when the element X reacts with another element value of atomic number 17 (iii) will the oxide of this element be acidic or basic

Answer 1

E. C of X = 2,8,3.as it is Aluminium.
At. No. 17 = Chlorine
Therefore when X will react with Cl it will form XCl3 or AlCl3.
as it is given in question we will write it X.
Its oxide will be both acidic and basic as it is amphoteric in nature. It will react with both acid and base to give salt and water.


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Answer 2

The element is placed so because the elements which have three shells can be placed and it is placed in the third period because it should surely have three electrons in the valence shell