Question

2) a) Electronegativity within a group from Period 4 to 5, then generally remains unchanged from Period 5 to 6. (1 mark) ay increases b. Decreases C. Stays the same d. None of these Explain your reasoning in 2a. (2 marks) is a Buendi pecode told the

Answer 1

Electronegativity decreases within a group from period 4 to 5, because down the group size of the elements increases, as size increases. the valance - electrons or bonded electrons becomes away from the nureus & so with increasing size attraction on electrons decreases and hence down the group electronegativity decreases from. period 4 to 5 but when we go from period 5 to 6 due to the addition of 4f electrons & lanthanide contraction size of the transition elements of period 5 and to becomes almost similar and electronegativity also becomes similar unchanged from period 5 to 6). so, option - B is the correct answer.