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The electronegativities (according to Pauling) of the elements in period 3 of the periodic table are as follows. The elements are arranged in alphabetical order: Al Cl Mg Na P S Si 1.5 3.0 1.2 0.9 2.1 2.5 1.8 (i) Arrange the elements in the order in which they occur in the periodic table from left to right. (The group 1 elements first, followed by the group 2 element and so on, up to group 7.)(ii) Choose the word or phrase from the brackets which correctly completes each of the following statements:(a) The element below sodium in the same group would be expected to have a _________ (lower/higher) electronegativity than sodium and the element above chlorine which would be expected to have a ________ (lower/higher) ionization potential than chlorine.(b) On moving from left to right in a given period, the number of shells _________ (remains the same/increases/decreases).(c) On moving down a group, the number of valence electrons __________ (remains the same/increases/decreases). |
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Answer» The electronegativities (according to Pauling) of the elements in period 3 of the periodic table are as follows. The elements are arranged in alphabetical order:
(i) Arrange the elements in the order in which they occur in the periodic table from left to right. (The group 1 elements first, followed by the group 2 element and so on, up to group 7.) (ii) Choose the word or phrase from the brackets which correctly completes each of the following statements: (a) The element below sodium in the same group would be expected to have a _________ (lower/higher) electronegativity than sodium and the element above chlorine which would be expected to have a ________ (lower/higher) ionization potential than chlorine. (b) On moving from left to right in a given period, the number of shells _________ (remains the same/increases/decreases). (c) On moving down a group, the number of valence electrons __________ (remains the same/increases/decreases). |
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