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①Ca2+:1s22s22p63s23p6
②F﹣:1s22s23p6
③
④Cr:1s22s22p63s23p63d44s2
⑤Fe:1s22s22p63s23p63d64s2
⑥Mg2+:1s22s22p6
⑦
H2S+ZnO═ZnS+H2O;
C2H5SH+ZnO═ZnS+C2H4+H2O;
C2H5SH+H2═C2H6+H2S;
COS+H2═CO+H2S;
CS2+4H2═CH4+2H2S
②某元素原子的价电子构型为3S2 , 它是区元素,元素符号为.
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