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प्रश्न
Give the names and symbols of the first twenty elements of the periodic table.
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उत्तर
| Name | Symbol | Name | Symbol |
| Hydrogen | H | Sodium | Na |
| Helium | He | Magnesium | Mg |
| Lithium | Li | Aluminium | Al |
| Beryllium | Be | Silicon | Si |
| Boron | B | Phosphorus | P |
| Carbon | C | Sulphur | S |
| Nitrogen | N | Chlorine | Cl |
| Oxygen | O | Argon | Ar |
| Fluorine | F | Potassium | K |
| Neon | Ne | Calcium | Ca |
संबंधित प्रश्न
Name the element used as a standard for atomic mass scale.
What is meant by atomicity? Name the diatomic element.
Fill in the blank:
Dalton used symbol _____ for oxygen and _____ for hydrogen.
Give two examples of the following:
Solid + Liquid mixture
An atom of an element is denoted by a “symbol” Explain the meaning of the term ‘symbol’. State a reason for representing the following element by its symbol.
Helium by ‘He’
Give a reason why elements are tabulated in a table called the ‘Periodic table’.
State the type of element for the following:
Oxygen
Write the radical of the following valency:
Calcium
Name three metals whose symbols are derived from the first letter of the name of the element.
Describe the different ways in which we can write the symbols of elements. Give appropriate examples.
