Form 3 Elements 問題
Elements A and B have the electronic arrangements 2,8,7 and 2,8,8,7
A ) Which one is more reactivity? Why?
B ) Which one has higher boiling point? Why?
- 1 十年前最愛解答
A) Both of them are belong to the group 7 (halogen) since they 7 electrons in the outermost shell. Element A is more reactive. Unlike group 1, group 7 reactivity decreases down under the group and the element is arranged by atomic number so element A has a higher posistion than B in group 7. So element A is more reactive.
B) Element B has higher boiling point. Sine the state of the element in group 7 is graudually change from gas state to soild state down to the group. Since element B has a lower position than element A . So it has higher boiling point
- 志仁Lv 61 十年前
a) A, since the size of the A is smaller, the atom catch electron easier.
b) B, since the size and weight of B is larger, more energy is need to make the atom to vapourize.
- 1 十年前
A) A. In group VII,reactivity decrease down the group.
B) B. In group VII,the state of element gradually change from gas to soild.資料來源： me