Lead can also form the [Pb9]4− anion, which is emerald green in solution.

PbSO4 is an ionic compound in which sulphate ion, SO42- is the anion. Since the charge on sulphate ion is -2; the charge on Pb ion is +2 and thus the oxidation state of Pb is +2 in PbSO4.

Sulfide (British English also sulphide) is an inorganic anion of sulfur with the chemical formula S2− or a compound containing one or more S2− ions.

Here are several examples of anions:

• Bromide – Br. –
• Chloride – Cl. –
• Fluoride – F. –
• Iodide – I. –
• Nitride – N. 3-
• Oxide – O. 2-
• Sulfide – S. 2-

Chlorine gains an electron, leaving it with 17 protons and 18 electrons. Since it has 1 more electron than protons, chlorine has a charge of −1, making it a negative ion.

noun Physical Chemistry. a negatively charged ion, as one attracted to the anode in electrolysis. any negatively charged atom or group of atoms (opposed to cation).

The anion is named by taking the elemental name, removing the ending, and adding “-ide.” For example, F-1 is called fluoride, for the elemental name, fluorine. If either the cation or the anion was a polyatomic ion, the polyatomic ion name is used in the name of the overall compound.

Monatomic anions are named by taking the root of the element name and applying an -ide ending. Other important simple anions. Monatomic anions do not occur with multiple charges, thus each nonmetal can form only one monatomic anion, unlike some of the metals which can have multiple monatomic cations.

The anion is sulfate ion = SO4. 2-.

For example, the compound strontium chloride consists of the cation Sr2+ combined with the anion Cl-. It is written SrCl2. When the cation and/or the anion is a polyatomic ion, parentheses may be used to group the atoms in the ion together to write the formula. The formula is written as CuSO4·5H2O.

1 Expert Answer Neutral atom of Fluorine has 7 valence electrons. To acquire noble gas configuration it has only 1 less electron so it gains 1 electron and complete its valence shell and acquire stable configuration so the most stable mono atomic ion formed by Fluorine is F^-1.

The hydrogen anion, H−, is a negative ion of hydrogen, that is, a hydrogen atom that has captured an extra electron. In chemistry, this ion is called hydride. The ion has two electrons bound by the electromagnetic force to a nucleus containing one proton.

Because hydrogen is a nonmetal and forms H- (hydride anions), it is sometimes placed above the halogens in the periodic table. Hydrogen has a much smaller electron affinity than the halogens. H2 dihydrogen or molecular hydrogen is non-polar with two electrons.

The Short Answer. Most ionic air purifiers (ionizers) are completely safe and not bad for your health. They emit negative ions into the air as a way to clean it which is harmless to you. They’re often confused with ozone generators which emit high levels of ozone that can be bad for health.

What are Negative Ions? With a negative ion air purifier, the purifier creates negative oxygen atoms, otherwise known as ions. The air purifier then releases the ions into the surrounding atmosphere. Negative ions occur naturally around large bodies of moving water such as waterfalls and rivers.

Should you get an air ionizer or an air purifier? Objectively, HEPA air purifiers do a better job of cleaning the air and trapping pollutant particles than ionic air purifiers, so we’d usually recommend an air purifier over an air ionizer, especially if you have allergies.

Specific effects may include throat irritation, coughing, chest pain and shortness of breath, as well as an increased risk of respiratory infections. Some ozone air purifiers are made with an ion generator, sometimes called an ionizer, in the same unit.