A-level化学例题分析（二）

知识点:

1.原子结构构造，质子、中子、电子相关概念

2．符号xyA的识别及各符号的意义

3.认识原子轨道形状，掌握电子排布式、轨道排布式写法

4.掌握电离能、电负性的概念

题型一：符号xyA的应用（主要以选择题为主）

答案：B

题型二：电子排布式（简答为主）

An atom,X,has a proton number of 16.Deduce the electron configuration of this atom.

答案：1s 22s 22p 63s23p4

题型三：电离能、电负性（选择简答为主）

The graph below shows the variation of the first ionisation energy with the number of protons for some elements.

Which statement is corred?

A. Elements Q and Y are in the same period in the Periodic Table.

B. The general increase from elements R to Y is due to increasing atomic radius.

C. The small decrease between dldments S and T is due to decreased shielding.

D. The small decrease between elements V and W is due to repulsion between paired electrons.

答案：D