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Description
| Question | Answer |
| what is the atomic number | The number of protons in an atom is called its atomic number. In the periodic table atoms are arranged in atomic number order. |
| what are electrons arranged in | Electrons are arranged in energy levels or shells, and different energy levels can hold different numbers of electrons. The electronic structure of an atom is a description of how the electrons are arranged, which can be shown in a diagram or by numbers. There is a link between the position of an element in the periodic table and its electronic structure. |
| label an atom | |
| what are the charges on the particles | |
| why do atoms have no overall charge | The total number of electrons in an atom is always the same as the number of protons in the nucleus. This means atoms have no overall electrical charge. |
| what are electrons arranged in | Electrons are arranged in different shells around the nucleus. The innermost shell - or lowest energy level - is filled first. Each succeeding shell can only hold a certain number of electrons before it becomes full |
| whats the maximum electrons the first three energy levels can hold | |
| describe the electronic structure of lithium | |
| what is the structure of the first 20 elements |
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