InterviewSolution
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InterviewSolution
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Three are three elements X,Y and Z having atomiv numbers of 6,16 and 19 respectively. Based on this information, Rakshit has been asked to answer the following questions: (a) In which group of the periodic table would you expect to find (i) element X (ii) element Y and (iii)( element Z? (b) Which two elements will form ionic bonds ? Why? (c) What will be the formula of ionic compound formed ? (d) Which two elements will form covalent bonds? Why? (e) What will be the formula of covalent compound formed? (f) What values are displayed by Rakshit in answering the above questions? |
Answer» Solution :In order to answer the questions Rakshit first wrote down the electronic CONFIGURATIONS of the element `X,Y` and `Z` by using their atomic numbers as follows:  (a) (i) Element `X` has 4 valence ELECTRONS in its atom, so it will occur in group `4+10=14` of the modern periodic table. (ii)Element `Y` has 6 valence electrons in its atom, so it will be found in group `6+10=16` of the modern periodic table. (iii) Element `Z` has just 1 valence electron in its atom, so it will be in group 1 of the modern periodic table. (b) An IONIC bond is formed between a metal element and a non-metal element. Now, element `Z` of group 1 is a metal and element `Y` of group 16 is a non-metal, therefore, the elements `Z` and `Y` will combine to form ionic bonds (Please note that element `X` of group 14 is ALSO a non-metal carbon but it does not combine with metals to form ionic bonds). (c) The element `Z` has 1 valence electron, so its valencyis 1 (or 1+). Element `Y` has 6 valence electron so its valency will be 2 (or `2-`). Here two `Z^(+)` ions will combine with one `Y^(2-)` ion so that the formula of ionic compound formed will be `Z_(2)Y`. (d) A covalent bond is formed between two non-metal elements. Here, element `X` of group 14 a non-metal and element `Y` of group 16 is also a non-metal therefore, the elements `X` and `Y` will combine together to form covalent bonds. (e) The element `X` has 4 valence electrons, so its valency is 4. The element `Y` has 6 valence electrons so its valency is 2. This means that one atom of element `X` will combined with two atoms of element `Y` to form a covalent compound having he formula `XY_(2)`. (f) The values displayed by Rakshit in answering these questions are (i) Knowledge of modern classification of elements (ii) Understanding of periodic table and chemical bonding and (iii) Problem solving skills. |
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