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Question
‘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.
Solution
Names and symbols of metal, non-metals, metalloids, and noble – gases out of 1st 20 elements.
| Metal | Symbol | Non-metal | Symbol |
| Lithium | Li | Hydrogen | H |
| Beryllium | Be | Carbon | C |
| Sodium | Na | Nitrogen | N |
| Magnesium | Mg | Oxygen | O |
| Aluminium | Al | Fluorine | F |
| Potassium | K | Phosphorus | P |
| Calcium | Ca | Sulphur | S |
| Chlorine | Cl |
| Metalloids | Symbol | Noble gas | Symbol |
| Boron | B | Helium | He |
| Silicon | Si | Neon | Ne |
| Argon | Ar |
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