Si l'on dit, à propos de l'ion Bi^3+, qu'il possède 127 neutrons, 83 protons, 81 électrons et 21

step 1 Hi. So today we're figuring out how many protons, electrons, and neutrons are in various atoms o

Si l'on dit, à propos de l'ion Bi^3+, qu'il possède 127...

Si l'on dit, à propos de l'ion $\mathrm{Bi}^{3+}$, qu'il possède 127 neutrons, 83 protons, 81 électrons et 210 nucléons, quelles sont les données certainement exactes, éventuellement exactes et certainement fausses?

Key Concepts

Isotopic Composition

Isotopic composition denotes the variation in neutron numbers among atoms of the same element. Although the number of protons remains constant, different isotopes have different numbers of neutrons, resulting in different mass numbers. Determining whether a given number of neutrons (and thus a particular mass number) is correct depends on specifying which isotope is in question.

Ionization and Electron Count

Ionization refers to the gain or loss of electrons resulting in a charged species. In an ion, the number of electrons does not necessarily equal the number of protons. For a cation like Bi³?, electrons are removed from an otherwise neutral atom, and the deficit of electrons relative to the number of protons determines the ion’s charge.

Atomic Number

The atomic number represents the number of protons in an atom’s nucleus and uniquely identifies the element. It is a fixed property for a given element, meaning that for bismuth, regardless of its isotopic form or ionic state, the number of protons (83) is always the same.

Mass Number (Nucleon Count)

The mass number is the total number of nucleons (protons plus neutrons) contained in an atom’s nucleus. It characterizes a particular isotope of an element. While it is calculated by adding the number of protons and neutrons, the value can vary between isotopes of the same element.

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