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Select the correct answers from the choices A, B, C, D which are given with reference to the variation of properties in the periodic table. Which of the following is generally true?A : Atomic size increases from left to right across a period. B : Ionisation energy increases from left to right across a period. C : Electropositive character increases going down a group. D : Electronegativity increases going down a group. |
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Answer» 1) A is wrong because when we move from left to right the atomic number increases. So, the nuclear attraction over outermost orbital increases. Therefore the atomic size decreases. 2) B is correct but it does not follow a regular trend in a period. 3) C is correct. As move from top to bottom in a group atomic size increases. Therefore it is easy to lose electrons. So electropositive character increases. 4) D is wrong because as we move from top to bottom in a group atomic size increases. So electronegativity decreases. |
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