Question

what is an atom????????????
what are polyatomic ions? give examples ​

Answer 1

Answer:

Atom, smallest unit into which matter can be divided without the release of electrically charged particles. It also is the smallest unit of matter that has the characteristic properties of a chemical element.

Polyatomic ions are ions which consist of more than one atom.

The atoms in a polyatomic ion are usually covalently bonded to one another, and therefore stay together as a single, charged unit.

For example, nitrate ion, NO3-, contains one nitrogen atom and three oxygen atoms

Answer 2

Answer:

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Atom :

An atom is the smallest unit of ordinary matter that forms a chemical element. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Atoms are extremely small, typically around 100 picometers across

Polyatomic ions :

Polyatomic ions are ions which consist of more than one atom. For example, nitrate ion, NO3-, contains one nitrogen atom and three oxygen atoms. The atoms in a polyatomic ion are usually covalently bonded to one another, and therefore stay together as a single, charged unit.

Examples :

Well-known examples of such polyatomic ions are the sulfate ion (SO42–), the hydroxide ion (OH–), the hydronium ion (H3O+), and the ammonium ion (NH4+).