# The combined number of protons and neutrons is the

## 2.3: Protons, Neutrons, and Electrons in Atoms

How To Calculate The Number of Protons, Neutrons, and Electrons - Chemistry

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The combined number of protons and neutrons is called Mass number. It is also called Nucleon number. Mass number is also called nucleon number, as it is the total number of protons and neutrons present inside a nucleus of an atom. What is the combined number of protons and neutrons called? Chemistry Matter Basic Atomic Structure. Aditya Banerjee. Nov 22,

Atoms are made up of particles called protons, neutrons, and electrons, which are responsible for the mass and charge of atoms. An atom is the smallest unit of matter that retains all of the chemical properties of an element. Atoms combine to form molecules, which then interact to form solids, gases, or liquids. For example, water is composed of hydrogen and oxygen atoms that have combined to form water molecules. Many biological processes are devoted to breaking down molecules into their component atoms so they can be reassembled into a more useful molecule. Atoms consist of three basic particles: protons, electrons, and neutrons.

The number of protons, neutrons, and electrons in an atom can be determined from a set of simple rules. Examples: Let's determine the number of protons, neutrons, and electrons in the following isotopes. The different isotopes of an element are identified by writing the mass number of the atom in the upper left corner of the symbol for the element. If the atoms are neutral, they also must contain six electrons. The only difference between these isotopes is the number of neutrons in the nucleus. Click here to check your answer to Practice Problem 1.

Atoms are the basic units of matter and the defining structure of elements.
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Dalton's Atomic Theory explained a lot about matter, chemicals, and chemical reactions. Nevertheless, it wasn't entirely accurate, because contrary to what Dalton believed, atoms can, in fact, be broken apart into smaller subunits or subatomic particles. We have been talking about the electron in great detail, but there are two other particles of interest to use: protons and neutrons. In this section, we'll look at the atom a little more closely. We already learned that J. Thomson discovered a negatively charged particle, called the electron. Rutherford proposed that these electrons orbit a positive nucleus.

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## What is an Atom?

How To Find The Number of Protons, Neutrons, and Electrons In an Atom or Ion

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Overview of Atomic Structure

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