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प्रश्न
What are elements? What are they made of?
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उत्तर
- Elements are chemically the simplest substances and hence cannot be broken down using chemical reactions.
- It is made of entirely from one type of atom.
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संबंधित प्रश्न
What is the difference between a pure substance and a mixture ?
Name: a Liquid Non-metal
Define a pure substance. How many types of pure substances do you know?
Find the atomicity of the Following molecule:
Acetic Acid
Fill in the blank
A diatomic gaseous element is _______.
Tick (√) the correct alternative from the choice given for the following statement.
The compound used as common salt is
Complete the statement given below by filling in the blanks with the correct words.
Atom contains ________ , with positively charged _____.
‘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.
Give three differences between elements & compounds with relevant examples.
Complete the table by writing the symbols of the following elements
| Element | Symbol |
| Aluminum | Al |
| Nickel | |
| Bromine | |
| Helium | |
| Magnesium |
