/ehs/taxonomy/term/215/all en /ehs/laboratory/radiation/introduction <div class="two-column-1"> <div> <p style="text-align:left">The atom can be thought of as a system containing a positively charged nucleus and negatively charged electrons which are in orbit around the nucleus.</p></div></div> Tue, 28 Jun 2011 16:22:18 +0000 admin 165 at /ehs