The most obvious piece of equipment a receptionist uses is a telephone, but there is a lot of variety in types and styles, from phone systems with a few lines to switchboards with multiple lines.
Modern Atomic Theory Bohr's model of the atom is important because it introduced the concept of the quantum in explaining atomic properties. However, Bohr's model ultimately needed revision becuase it failed to explain the natue of atoms more complicated than hydrogen.rwin Schrodinger developed the equation which is used today to understand atoms and molecules-the Schrodinger Equation (1926) Erwin Schrodinger took the ideas developed by de Broglie, Heisenberg and others and put them together in a single equation that is named after him.
Chemicals are built from atoms and atoms usually behave in predictable ways but to understand how they can do this and why it is so predictable, you need to know about atomic structure first. 1. Protons. Protons are positively charged particles which form part of the nucleus of an atom. Their mass is incredibly small, to write down the actual number is pointless as it is impossible for the human mind to grasp their scale.