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margin-top: 0; margin-bottom: 0; margin-left:8px"> <b> <font color="#0000FF" size="2">您所在的位置�?a href=""><font color="#0000FF">化学化工实验教学中心</font></a>>></font><font color="#FF0000" size="2">元素周期表查�?/font></b></td> </tr> <tr> <td valign="top" align="center"> <DIV align="center" > <DIV align="center"> <h2 style="text-align: center"><font color="#0000FF">化学元素周期�?/font></h2> <p align="left"> <font size="2">　　现代化学的元素周期律�?869年俄国科学家门捷列夫(Dmitri Mendeleev)首创的，他将当时已知�?3种元素依原子量大小并以表的形式排列，把有相似化学性质的元素放在同一行，就是元素周期表的雏形。利用周期表，门捷列夫成功的预测当时尚未发现的元素的特�?镓、钪、锗)�?913年英国科学家莫色勒利用阴极射线撞击金属产生X射线，发现原子序越大，X射线的频率就越高，因此他认为核的正电荷决定了元素的化学性质，并把元素依照核内正电荷(即质子数或原子序)排列，经过多年修订后才成为当代的周期表�?br> 　　在周期表中，元素是以元素的原子序排列，最小的排行最先。表中一横行称为一个周期，一列称为一个族�? </font> </p> <hr class="dichr2"> <div align="center"> <div class="elbox"> <div class="elboxs3">�?br>�?/div> <div class="elboxs2"><br>I A</div> <div class="elboxs2"></div> <div class="elboxs2"></div> <div class="elboxs2"></div> <div class="elboxs2"></div> <div class="elboxs2"></div> <div class="elboxs2"></div> <div class="elboxs2"></div> <div class="elboxs2"></div> <div class="elboxs2"></div> <div class="elboxs2"></div> <div class="elboxs2"></div> <div class="elboxs2"></div> <div class="elboxs2"></div> <div class="elboxs2"></div> <div class="elboxs2"></div> <div class="elboxs2"></div> </div> <div class="elbox"> <div class="elboxs3"><br>1</div> <div class="elboxs elc7"><a href="/html/oldqdychemlabchemisrtyyuansuzhouqibiaoElementsHydrogen.html" target="xx"><span class="elrd"> 1</span> <span class="elff">H</span><br> <span class="eltl">�?/span><br><span class="elen">1.0079</span></a></div> <div class="elboxs2"><br>IIA</div> <div class="elboxs0">化学元素周期�?/div> <div class="elboxs2"><br>IIIA</div> <div class="elboxs2"><br>IVA</div> <div class="elboxs2"><br>VA</div> <div class="elboxs2" style="width: 47px; 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margin-top: 0; margin-bottom: 0; margin-left:8px"> <b> <font color="#0000FF" size="2">您所在的位置�?a href=""><font color="#0000FF">化学化工实验教学中心</font></a>>></font><font color="#FF0000" size="2">元素周期表查�?/font></b></td> </tr> <tr> <td valign="top" align="center"> <DIV align="center" > <DIV align="center"> <h2 style="text-align: center"><font color="#0000FF">化学元素周期�?/font></h2> <p align="left"> <font size="2">　　现代化学的元素周期律�?869年俄国科学家门捷列夫(Dmitri Mendeleev)首创的，他将当时已知�?3种元素依原子量大小并以表的形式排列，把有相似化学性质的元素放在同一行，就是元素周期表的雏形。利用周期表，门捷列夫成功的预测当时尚未发现的元素的特�?镓、钪、锗)�?913年英国科学家莫色勒利用阴极射线撞击金属产生X射线，发现原子序越大，X射线的频率就越高，因此他认为核的正电荷决定了元素的化学性质，并把元素依照核内正电荷(即质子数或原子序)排列，经过多年修订后才成为当代的周期表�?br> 　　在周期表中，元素是以元素的原子序排列，最小的排行最先。表中一横行称为一个周期，一列称为一个族�? </font> </p> <hr class="dichr2"> <div align="center"> <div class="elbox"> <div class="elboxs3">�?br>�?/div> <div class="elboxs2"><br>I A</div> <div class="elboxs2"></div> <div class="elboxs2"></div> <div class="elboxs2"></div> <div class="elboxs2"></div> <div class="elboxs2"></div> <div class="elboxs2"></div> <div class="elboxs2"></div> <div class="elboxs2"></div> <div class="elboxs2"></div> <div class="elboxs2"></div> <div class="elboxs2"></div> <div class="elboxs2"></div> <div class="elboxs2"></div> <div class="elboxs2"></div> <div class="elboxs2"></div> <div class="elboxs2"></div> </div> <div class="elbox"> <div class="elboxs3"><br>1</div> <div class="elboxs elc7"><a href="/html/oldqdychemlabchemisrtyyuansuzhouqibiaoElementsHydrogen.html" target="xx"><span class="elrd"> 1</span> <span class="elff">H</span><br> <span class="eltl">�?/span><br><span class="elen">1.0079</span></a></div> <div class="elboxs2"><br>IIA</div> <div class="elboxs0">化学元素周期�?/div> <div class="elboxs2"><br>IIIA</div> <div class="elboxs2"><br>IVA</div> <div class="elboxs2"><br>VA</div> <div class="elboxs2" style="width: 47px; 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