<font face="宋体" size="3">
</font><p><span>钠的原子序号为</span><font face="Times New Roman"><span lang="EN-US">11</span></font><span>,核电荷数</span><font face="Times New Roman"><span lang="EN-US">z=11</span></font><span>,核外电子数</span><font face="Times New Roman"><span lang="EN-US">N=10</span></font><span>,有</span></p><font face="宋体" size="3">
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