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What is the atomic number of an atom?

The atomic number of an atom is the number of protons in its nucleus. Remember that: the atomic number of each element is unique - no two elements have the same atomic number An atom contains equal numbers of protons and electrons. Since protons and electrons have equal and opposite charges, this means that atoms are neutral overall.

How are atoms calculated?

Atoms consist of a nucleus containing protons and neutrons, surrounded by electrons in shells. The number of subatomic particles in an atom can be calculated from the atom's atomic number and mass number. Ideas about atoms have changed over time. Scientists developed new atomic models as they gathered new experimental evidence.

Why is atom a building block of Chemistry?

It also is the smallest unit of matter that has the characteristic properties of a chemical element. As such, the atom is the basic building block of chemistry. Most of the atom is empty space. The rest consists of a positively charged nucleus of protons and neutrons surrounded by a cloud of negatively charged electrons.

What is atom in chemistry?

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. As such, the atom is the basic building block of chemistry. Most of the atom is empty space.

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