Calcium is a metallic element that has the atomic number 20. Some of its most important chemical properties are that it has 10 isotopes, an atomic mass of 50.08 grams per mole and a melting point of 840 degrees Celsius. ... More » Science Chemistry Atoms & Molecules

The chemical formula for calcium chloride is CaCl2. Calcium chloride contains one calcium atom that is bound to two chlorine atoms. It has a molecular weight of 110.984. More » Science Chemistry Solutions & Mixtures

Sodium chloride is composed of approximately 60 percent chloride and 40 percent sodium elements. Commonly known as table salt, it is a white-colored or transparent water-soluble crystalline solid with the chemical symbol... More » Science Chemistry
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Periodic law, also known as Mendeleev's law, is the concept that the chemical and physical properties of elements are based on an element's atomic weight when arranged by increasing periodic atomic number. Periodic law w... More » Science Chemistry Atoms & Molecules

The chemical properties of an element are determined by the electrons in the partly filled outermost shell. This shell is referred to as the valence shell. There are one or more subshells in each shell, and each subshell... More » Science Chemistry Atoms & Molecules

The modern periodic table is based upon the atomic number and the physical properties of each element. The periods, or rows, are arranged by increasing atomic number. Each column, or group, of elements has similar physic... More » Science Chemistry Atoms & Molecules

The atomic number indicates the number of protons present in the nucleus of an atom, which is used to uniquely identify the atom, as well as its chemical properties. The atomic number is denoted by the universal symbol "... More » Science Chemistry Atoms & Molecules