短周期元素Q、R、T、W在元素周期表中的位置如右图所示，其中T所处的周期序数与主族序数相等，下列说法正确的是
| A．W在周期表中的位置是第三周期，ⅤA族 |
| B．原子半径Q>R>T |
| C．W原子得电子能力强于Q原子，且可形成共价化合物Q W2 |
| D．原子序数比R多1的元素只有一种氢化物 |
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