Quel est le nombre de neutrons, de protons et d'électrons...

Quel est le nombre de neutrons, de protons et d'électrons présents dans chacun des atomes ou des ions suivants? $$ { }_{25}^{55} \mathrm{Mn} \quad{ }_{18}^{40} \mathrm{Ar} \quad{ }_{42}^{96} \mathrm{Mo} \quad{ }_{22}^{48} \mathrm{Ti} \quad{ }_{82}^{207} \mathrm{~Pb}^{2+} \quad{ }_{35}^{80} \mathrm{Br}^{-} \quad{ }_{51}^{122} \mathrm{Sb}^{3+} \quad{ }_{15}^{31} \mathrm{P}^{3-} $$

Quel est le nombre de neutrons, de protons et d'électrons présents dans chacun des atomes ou des ions suivants?
$$
{ }_{25}^{55} \mathrm{Mn} \quad{ }_{18}^{40} \mathrm{Ar} \quad{ }_{42}^{96} \mathrm{Mo} \quad{ }_{22}^{48} \mathrm{Ti} \quad{ }_{82}^{207} \mathrm{~Pb}^{2+} \quad{ }_{35}^{80} \mathrm{Br}^{-} \quad{ }_{51}^{122} \mathrm{Sb}^{3+} \quad{ }_{15}^{31} \mathrm{P}^{3-}
$$

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Key Concepts

Atomic Number

The atomic number of an element indicates the number of protons in the nucleus and defines the chemical identity of the element. It is denoted by the lower-left number in the nuclear notation and is crucial for determining the element's position in the periodic table.

Mass Number

The mass number is the sum of protons and neutrons present in the nucleus of an atom. It is represented by the upper number in the nuclear notation and provides information about the isotope of the element.

Neutron Calculation

The number of neutrons in an atom can be calculated by subtracting the atomic number from the mass number. This concept is important for understanding different isotopes and their variations in nuclear composition.

Ionic Charge and Electron Count

For ions, the charge affects the number of electrons present. A positively charged ion (cation) has fewer electrons than protons, while a negatively charged ion (anion) has more electrons than protons. Determining the electron count involves starting with the electron count for a neutral atom (equal to the atomic number) and then adjusting by the charge of the ion.

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