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प्रश्न
‘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.
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उत्तर
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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संबंधित प्रश्न
Give one example for the following type of mixtures
solid-solid homogenous mixture.
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Indicate whether the following statement is true or false:
Molecules combine to form atoms
Tick (√) the correct alternative from the choice given for the following statement.
Sugar is a compound which consists of the elements
Complete the statement given below by filling in the blanks with the correct words.
Atom contains ________ , with positively charged _____.
Complete the statement given below by filling in the blank with the correct word.
Element ______ has the symbol derived from its Latin name ‘Argentum’
Define the terms elements, compounds & mixtures with a view to show their basic difference.
Elements are made up of______ kinds of atoms.
Reason out
Elements are called semimetals.
