Source: https://sciences.edu.umontpellier.fr/files/2016/11/D%C3%A9termination-de-la-g%C3%A9om%C3%A9trie-d%E2%80%99une-mol%C3%A9cule-%C3%A0-l%E2%80%99aide-de-la-m%C3%A9thode-VSEPR.pdf