Objective Knowledge Check Question 13 Write the chemical symbols for three different atoms or atomic anions with 18 electrons. 000 םיםי X 5 ? O ATOMS, IONS AND MOLECULES Identifying the parts of an atom Complete the table below, using the diagram of an atom shown at right. Properties of subatomic particles approximate name symbol charge (in multiples of e) mass location on diagram (amu) X 0.0005 B electron ☐ ☐ (choose one): (choose one): neutron ☐ (choose one) (choose one) s ?