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Definition
| metallic elements that are strongly reactive, soft, have low densities |
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Definition
| Metallic elements that are reactive, fairly soft and have fairly low densities. |
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Definition
| is the mass of an average atom of an element |
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Definition
| of the element, the number of protons in the nucleus of each one of its atoms |
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Term
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Definition
| is a diagram that shows the number of electrons in each of the energy levels around an atom. |
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Definition
| non-metallic elements that are strongly reactive and are gases at room temperature. |
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Definition
| are hard solids at room temperature |
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Definition
| are solids at room temperature |
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Term
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Definition
| if the atoms can gain or lose electrons in more than one way. |
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Definition
| non-metallic elements that are very unreactive and are colourless, odourless gases at room temperature |
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Definition
| some gases some solids at room temperature. |
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Term
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Definition
| is the smallest particles of an element that still has the identity and properties of the element |
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