[ 413 ] Physical Science GED ® TEST SCIENCE FLASH REVIEW • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • Match the part of the atom with the correct definition. 1. protons 2. neutrons 3. electrons a. negatively charged particles orbiting around the nucleus b. positively charged particles within the nucleus of an atom c. particles within a nucleus without a positive or negative charge The atomic number of an element is related to the number of protons in the nucleus. Looking at the chart, what can you conclude about the way the elements are organized? What is the difference between ionic and covalent bonds in molecules?