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प्रश्न
There are ______ number of known elements.
रिकाम्या जागा भरा
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उत्तर
There are 118 number of known elements.
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संबंधित प्रश्न
Match the columns.
| column A | column B |
|
1. to separate grain from chaff |
a. filtration |
| 2. to saparate sawdust from water | b. sedimentation and deeantation |
| 3. to separate iodine from sodium chloride | c. winnowing |
| 4. to separate iron fillings from sand | d.sublimation |
|
5. it is used to separate sand and water |
e maganetic separation |
|
|
f .handpicking |
Tick the most appropriate answer.
How many times is a proton heavier than an electron?
- 1500
- 1800
- 1840
- none of these
Define: Molecule
Fill in the blank
A liquid non-metal is _______.
Indicate whether the following statement is true or false:
Noble gases are high reactive
Elements are the______ form of pure substances.
Higher Order Thinking Skills.
List out the metals, non-metals and metalloids which you use in your house, schools. Compare their properties.
Why are utensils made up of aluminium and brass?
Elements contain the ______of the same kind.
Give the chemical formula for cane sugar.
