All substances are made of atoms. A substance that is made of only one sort of atom is called an element. The elements are shown in the periodic table and each group contains elements with similar properties.
Atoms of each element are represented by a chemical symbol.
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Atoms have small central nucleus, which is made up of protons and neutrons around which there are electrons.
The electrical charges are: proton +1, neutron 0 and electron -1.
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In an atom, the number of electrons is equal to the number of protons in the nucleus. Atoms have no overall electrical charge.
All atoms of the simillar element have the same number of protons.
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The number of protons in an atom is its atomic number.
Electrons occupy particular energy levels. Each electron in an atom is at a particular energy level (in a particular shell). The electrons in an atom occupy the lowest available energy (innermost available shells).
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The charge on the electrons is the same size as the charge on the electrons.
The number of protons always equals the number of elect
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Other cards in this set
Card 2
Front
The electrical charges are: proton +1, neutron 0 and electron -1.
Back
Atoms have small central nucleus, which is made up of protons and neutrons around which there are electrons.
Card 3
Front
All atoms of the simillar element have the same number of protons.
Back
Card 4
Front
Electrons occupy particular energy levels. Each electron in an atom is at a particular energy level (in a particular shell). The electrons in an atom occupy the lowest available energy (innermost available shells).
Back
Card 5
Front
The number of protons always equals the number of elect
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