Нижний и надстрочный индексы: позиционирование вместо vertical-align.
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<p>My name is Doctor Womac and I am going to teach you all about chemical formulae. A chemical formula is a way to describe the chemical elements that make up a particular chemical compound. It consists of chemical symbols to covey the elements and numbers to show the number of atoms of each element. H<span class="atoms">2</span>SO<span class="atoms">4</span> is the chemical formula for sulphur for example. The charge of an ion can be displayed in superscript, such as Au<span class="charge">2+</span>. This concludes my lesson. I must rush off home now because I have a problem with some radioactive phosphate.</p>
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