effective atomic number (EAN),number that represents the total number of electrons surrounding the nucleus of a metal atom in a metal complex. It is composed of the metal atom's electrons and the bonding electrons from the surrounding electron-donating atoms and molecules. Thus the effective atomic number of the cobalt atom in the complex [Co(NH3)6]3+ is 36, the sum of the number of electrons in the trivalent cobalt ion (24) and the number of bonding electrons from six surrounding ammonia molecules, each of which contributes an electron pair (2 × 6 =12).
The English chemist Nevil V. Sidgwick made the observation, since known as the EAN rule, that in a number of metal complexes the metal atom tends to surround itself with sufficient ligands that the resulting effective atomic number is numerically equal to the atomic number of the noble-gas element found in the same period in which the metal is situated. This rule seems to hold for most of the metal complexes with carbon monoxide, the metal carbonyls as well as manyorganometallic compounds. By using this rule it is possible to predict the number of ligands in these types of compounds and also the products of their reactions. The EAN rule is often referred to as the "18-electron rule" since, if one counts only valence electrons (6 for Co3+ and 2 × 6 = 12 for 6 NH3), the total number is 18.
Blood is not a element. Atomic number is about protons. Number of protons in a atom.
7.64
Quartz is a compound, specifically silicon dioxide, and compounds do not have atomic numbers; only atoms do.
Argon (atomic number 18) is the noble gas that is nearest to calcium (atomic number 20)
Detergent is composed of chemical compounds of a variety of types and thus has no "atomic number". Only elements have atomic numbers: all elements are given in the Periodic Table and are arranged by their atomic numbers. The atomic number equals the number of protons in the nucleus of the atom: each element is distinct in the number of protons the atoms contain.
"Atomic number" is an expression for chemical elements, not for compounds.
Atomic number is a term used for chemical elements not for compounds.
Calcite is a compound. Atomic number is appropriate only for elements, not compounds.
No. Elements are composed of atoms that have the same number of protons (atomic number) in their atomic nuclei. Compounds are composed of two or more elements that are chemically combined.
No. Elements are composed of atoms that have the same number of protons (atomic number) in their atomic nuclei. Compounds are composed of two or more elements that are chemically combined.
Blood is not a element. Atomic number is about protons. Number of protons in a atom.
7.4
Only elements have atomic numbers, not compounds.
Protons that are contained within any and all Atomic [Elemental] Nucleus / Nucleii.
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Quartz is a compound, specifically silicon dioxide, and compounds do not have atomic numbers; only atoms do.
there are two for silicone.those are 0 and 4.Atomic silicon has oxidation number 0. It forms a wide variety of compounds, specially with oxygen. In these compounds, the oxidation number of silicon can vary from 0 to +4.