Their energies and their shapes.
This is Mr. Orensky from TAS.
This better not be one of my students asking this!
Elements in the same group have similar electronic configurations. For example, all elements in Group 1 contain 1 unpaired electron located in an S orbital. It's the electronic configuration of atoms (and to a lesser degree, their size and charge) which dictate their chemical properties. Nuclear properties, on the other hand are dictated largely by the atoms size and number of protons and neutrons. Chemists, for the most part, aren't interested in these.
X-ray technicians
Special properties are unusual properties a mineral may have that most minerals don't.
Electrons
There is no fully objective answer to this question. Many chemists would consider that two lanthanide elements with atomic numbers differing by only one would be likely to qualify. Another possibility is the pair zirconium and hafnium. These are very similar in most chemical characteristics but differ greatly in electron capture tendencies in nuclear reactors.
Syndol is back already at most chemists. Boots, Lloyds Pharmacy, the Garden Pharmacy etc.
Elements in the same group have similar electronic configurations. For example, all elements in Group 1 contain 1 unpaired electron located in an S orbital. It's the electronic configuration of atoms (and to a lesser degree, their size and charge) which dictate their chemical properties. Nuclear properties, on the other hand are dictated largely by the atoms size and number of protons and neutrons. Chemists, for the most part, aren't interested in these.
Marie Curie.
Glycerin is available at most chemists.
There are lots of examples unused single letters and pairs of letters- two most commonly used by chemists when they wan't to discuss generic properties, are X (often used to represent the halogens), M (used for metals)
Pads are on sale at most supermarkets and chemists.
The man who first suggested orbitals (in their most primitive form) was Neils Bohr - the concept has been improved upon since him however.
If you are interested in the functionalist approach to psychology, you would be most interested in
Most chemists work with chemicals and chemical reactions; indeed, it is somewhat of a requirement that chemistry should involve chemicals.
solar system
X-ray technicians
The chemical properties of calcium are most similar to (in between) the chemical properties of magnesium and strontium.