(1)用数字和符号表示:
①2个氢离子____;
②2个硫离子____;
③3个铵根离子______;
④2个氮分子_______;
⑤+5价氯元素_____;
⑥3个水分子____。
(2)请写出下列各符号的意义:
①2H______________________
②3N2______________
③_______________
④4Na+______________________
⑤2H2O____________________
⑥3Fe2+________________________
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