Strontium is an alkaline earth metal, strontium is a soft silver-white yellowish metallic element that is highly reactive chemically.
Protons and Neutrons in Strontium
Strontium is a chemical element with atomic number 38 which means there are 38 protons in its nucleus. Total number of protons in the nucleus is called the atomic number of the atom and is given the symbol Z. The total electrical charge of the nucleus is therefore +Ze, where e (elementary charge) equals to 1,602 x 10-19 coulombs.
The total number of neutrons in the nucleus of an atom is called the neutron number of the atom and is given the symbol N. Neutron number plus atomic number equals atomic mass number: N+Z=A. The difference between the neutron number and the atomic number is known as the neutron excess: D = N – Z = A – 2Z.
For stable elements, there is usually a variety of stable isotopes. Isotopes are nuclides that have the same atomic number and are therefore the same element, but differ in the number of neutrons. Mass numbers of typical isotopes of Strontium are 84; 86-88.
Main Isotopes of Strontium
Stronitium occurs in 5 natural isotopes: 84Sr, 86Sr, 87Sr, 88Sr, and 90Sr. Of these, 90Sr is a trace radioisotope, decaying by beta decay with a half-life of 28.90 years.. 88Sr is the most common isotope, having a natural abundance of approximately 82%.
Stronitium-84 is composed of 38 protons, 46 neutrons, and 38 electrons.
Stronitium-86 is composed of 38 protons, 48 neutrons, and 38 electrons.
Stronitium-87 is composed of 38 protons, 49 neutrons, and 38 electrons.
Stronitium-88 is composed of 38 protons, 50 neutrons, and 38 electrons.
Stronitium-90 is composed of 38 protons, 52 neutrons, and 38 electrons.
Electrons and Electron Configuration
The number of electrons in an electrically-neutral atom is the same as the number of protons in the nucleus. Therefore, the number of electrons in neutral atom of Strontium is 38. Each electron is influenced by the electric fields produced by the positive nuclear charge and the other (Z – 1) negative electrons in the atom.
Since the number of electrons and their arrangement are responsible for the chemical behavior of atoms, the atomic number identifies the various chemical elements. The configuration of these electrons follows from the principles of quantum mechanics. The number of electrons in each element’s electron shells, particularly the outermost valence shell, is the primary factor in determining its chemical bonding behavior. In the periodic table, the elements are listed in order of increasing atomic number Z.
Electron configuration of Strontium is [Kr] 5s2.
Possible oxidation states are +2.
Most Common Application of Strontium
Consuming 75% of production, the primary use for strontium was in glass for colour television cathode ray tubes. Strontium is best known for the brilliant reds its salts give to fireworks and flares.
|Number of protons||38|
|Number of neutrons (typical isotopes)||84; 86-88|
|Number of electrons||38|
|Electron configuration||[Kr] 5s2|
Properties of other elements