Atomic Numbers for Polyatomic Ions

Thread starter rmiller70015
Start date Oct 14, 2017
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Atomic Ions Numbers

In summary, an atomic number is a unique number that identifies an element based on the number of protons in its nucleus. It is represented by the letter Z and is typically found above the element's symbol on the periodic table. The atomic number for polyatomic ions is determined by adding the number of protons in each atom that makes up the ion. It helps to determine the properties and reactivity of the ion, as well as its charge and mass. The atomic number of a polyatomic ion cannot change, but its charge can. Cations have an atomic number equal to the number of protons, while anions have an atomic number equal to the number of protons plus the number of additional electrons.

Oct 14, 2017

rmiller70015

In the Debye-Huckle Equation there are a few z terms referring to atomic number. But what if the ion is polyatomic? Is it just the sum of the atomic numbers or is there something else that needs to be used?
Never mind, it's the charge number not the atomic number.

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Oct 16, 2017

jim mcnamara

Mentor

Closed - this is a 'nevermind' question.

What is an atomic number?

An atomic number is a unique number that identifies an element based on the number of protons in its nucleus. It is represented by the letter Z and is typically found above the element's symbol on the periodic table.

How do you determine the atomic number for polyatomic ions?

The atomic number for polyatomic ions is determined by adding the number of protons in each atom that makes up the ion. For example, the polyatomic ion sulfate (SO₄^2-) has a total of 32 protons (16 from sulfur and 16 from oxygen), so its atomic number is 32.

Why are atomic numbers important for polyatomic ions?

The atomic number of a polyatomic ion is important because it helps to determine its properties and reactivity. It also helps to identify the charge and mass of the ion, which are important factors in chemical reactions.

Can the atomic number of a polyatomic ion change?

No, the atomic number of a polyatomic ion cannot change. The atomic number is determined by the number of protons, which cannot be altered without changing the element itself. However, the charge of a polyatomic ion can change, which will affect its overall properties and behavior.

How are atomic numbers different for cations and anions?

Cations, or positively charged ions, have an atomic number that is equal to the number of protons in the ion. Anions, or negatively charged ions, have an atomic number that is equal to the number of protons plus the number of additional electrons in the ion.