![]() Radius is the size of an atom’s electron cloud and it increases going down and to the left on the periodic table. 3.1 Formula Mass and the Mole Concept 3.2 Determining Empirical and Molecular Formulas 3.3 Molarity 3. Acidity increases going down and to the right on the periodic table.Īnd finally we have R which is Radius. This is the ability of a molecule to donate protons and solution. Next we have A, which stands for Acidity. The atomic number of each element increases by one, reading from left to right. PeriodA horizontal row in the periodic table. Members of a group typically have similar properties and electron configurations in their outer shell. It is used to make fertilisers, nitric acid, nylon, dyes and explosives. GroupA vertical column in the periodic table. Nitrogen is important to the chemical industry. Ionization energy is the amount of energy required to remove an electron from an atom. Nitrogen is important for plant growth and can be ‘fixed’ by lightning or added to soils in fertilisers. All of these E’s increase going up and to the right of the periodic table.Įlectronegativity is the ability of an atom to attract electrons to itself at a covalent bond.Įlectron affinity is the energy associated when you add an electron to an atom. ![]() ![]() As you can see, basicity increases going up and to the left of the periodic table.Į stands for three things: Electronegativity, Electron affinity, and ionization Energy. B stands for basicity, the ability of molecules to accept protons. The mnemonic is bear: B E A R.Īnd each letter stands for different chemical properties. The periodic trends tell you in which direction of the periodic table do you have increasing values for different chemical properties. Today we have another general chemistry mnemonic for you and that mnemonic is for periodic trends. I’m Ken and I’m an MCAT expert with MedSchoolCoach. Welcome back to another MCAT Mnemonic Monday. Ken Tao is the MedSchoolCoach expert on MCAT, and uses the acronym “BEAR” to help you remember the periodic trends for basicity, electronegativity, electron affinity, and ionization energy, acidity and radius.
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