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.
The effective atomic number for metallocenes can be calculated by considering the average atomic number of the metal atoms in the molecule and the number of metal atoms present. You can sum the product of the atomic number and the quantity of each metal atom in the molecule, and then divide by the total number of metal atoms to get the effective atomic number.
Blood is not a element. Atomic number is about protons. Number of protons in a atom.
The effective atomic number of human tissue varies depending on the specific type of tissue. On average, the effective atomic number of human tissue is around 6.5. This value represents a weighted average of the atomic numbers of the elements present in the tissue.
Sulfide is not an element by itself, it is a compound. The atomic number of sulfur (S), the element found in sulfide compounds, is 16.
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.
Calcite is a compound. Atomic number is appropriate only for elements, not compounds.
The effective atomic number for metallocenes can be calculated by considering the average atomic number of the metal atoms in the molecule and the number of metal atoms present. You can sum the product of the atomic number and the quantity of each metal atom in the molecule, and then divide by the total number of metal atoms to get the effective atomic number.
Blood is not a element. Atomic number is about protons. Number of protons in a atom.
Protons that are contained within any and all Atomic [Elemental] Nucleus / Nucleii.
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.
The effective atomic number of human tissue varies depending on the specific type of tissue. On average, the effective atomic number of human tissue is around 6.5. This value represents a weighted average of the atomic numbers of the elements present in the tissue.
Only elements have atomic numbers, not compounds.
The atomic number of an element is the number of protons in its nucleus, which determines its effective nuclear charge. In the case of oxygen, which has an atomic number of 8, the effective nuclear charge is the attraction felt by the outermost electrons towards the nucleus, and it increases as the atomic number increases.
Cotton is made up of complex organic compounds like cellulose and lignin, which do not have an atomic number as they are not elements.
"Atomic number" is an expression for chemical elements, not for compounds.
Sulfide is not an element by itself, it is a compound. The atomic number of sulfur (S), the element found in sulfide compounds, is 16.