Write the ground-state electron configurations of the following ions, which play important roles in biochemical processes in our bodies: (a) Na1, (b) Mg21, (c) Cl2, (d) K1, (e) Ca21, (f) Fe21, (g) Cu21, (h) Zn21.
Topic 1: Stoichiometry 1. Introduction to the particulate nature of matter and chemical change Atoms combine chemically in fixed ratios to form compounds, e.g. every water molecule has 2 hydrogen and 1 oxygen (H O). 2 2. Compounds have different properties from their component elements, e.g. both H & 2 O 2re gases at STP, but water is liquid. Substances that do not bond chemically form mixtures when combined, e.g. salt + water (homogeneous) sand + water (heterogeneous) 3. Not all atoms of an element are exactly the same. Instead, they may differ in the number of neutrons (uncharged nuclear particles) and therefore they different slightly in their atomic mass, we refer instead to their isotopic mass. Isotopes differ from one an
