你答的是SAT的题吧?
问题1：写出氧的符号.尝试不要看元素周期表.答：O
问题2：锂元素中有多少质子和电子?它问的有点问题,应该是or,因为原子中质子数=电子数
如果原题是and,那么就是6.如果是or就是3.
回答完毕.
Write the symbol of oxygen. Try to do this without referring
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