Atoms

Atoms

The nucleus of an atom
1. In the middle of the atom
2. contains protons and neutrons
3. has a positive charge because of the protons
4. almost the whole mass is concentrated in the nucleus
The electrons in an atom
1. Move around the nucleus in electron shells
2. Negatively charged
3. Are tiny but cover a lot of space
4. The volume of their orbits determines the size of the atom
5. Have virtually no mass
Protons, neutrons and electrons
1. Protons are heavy and positively charged
  1. The number of protons equals the number of electrons
2. Neutrons are heavy and neutral
3. Electrons are tiny and negatively charged
The mass number and atomic number
1. Mass number = total no. protons and neutrons
  1. This is always the biggest number
2. Atomic number - number of protons

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