Chemistry
'The modern periodic table consists of elements arranged according to their increasing atomic numbers'. With reference to elements with atomic numbers 1 to 20 only in the periodic table — differentiate them into — metallic elements, metalloids, non-metals & noble gases.
Elements, Compounds & Mixtures
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Answer
Elements with atomic numbers 1 to 20 are classified into metallic elements, metalloids, non-metals and noble gases in the table below:
| Metals | Metalloids | Non-metals | Noble gases |
|---|---|---|---|
| Lithium | Boron | Carbon | Helium |
| Beryllium | Silicon | Nitrogen | Neon |
| Sodium | Oxygen | Argon | |
| Magnesium | Phosphorous | ||
| Aluminium (weak metal) | Sulphur | ||
| Potassium | Fluorine | ||
| Calcium | Chlorine |
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