A.1s22s22p2 | B.1s22s22p5 | C.1s22s22p63s1 | D.1s22s22p6 |
A.原子半径最小的是氢 | B.所含元素种类最多的族是第VIII族 |
C.金属元素的种类多于非金属元素 | D.第n周期第n主族的元素不一定为金属 |
A.铍 | B.硼 | C.碳 | D.氮 |
A.X:3s23p1 Y:3s23p5 | B.X:2s22p3 Y:2s22p4 |
C.X:3s23p1 Y:3s23p4 | D.X:3d64s2 Y:2s22p4 |
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