生成这个题目的讲解---The extracted content from the image is as follows:
**Question Stem:**
11. 下图为元素周期表短周期的一部分，其中X元素原子最外层电子数是次外层的两倍。下列说法不正确的是（ ）
**Options:**
A. X的原子半径比Y的大
B. Y元素的非金属性比Z强
C. Z元素位于第3周期IVA族
D. W的氧化物的水化物是强酸
**Chart Description:**
* **Type:** A grid/table representing a portion of the periodic table.
* **Main Elements:**
* The table is a 2x3 grid, but only four cells are filled with element symbols.
* The top-left cell contains the symbol "X".
* The top-right cell contains the symbol "Y". (There is an empty cell between X and Y in the top row).
* The bottom-left cell contains the symbol "Z".
* The bottom-right cell contains the symbol "W". (There is an empty cell between Z and W in the bottom row).
* This arrangement indicates that X and Y are in the same period, and Z and W are in the period immediately below. Also, X and Z are in the same group, and Y and W are in the same group.
* **Labels and Annotations:**
* Below the table, it is labeled "第 11 题图" (Figure for question 11).