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प्रश्न
Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.
Name a non-metal which is required for combustion.
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उत्तर
Oxygen
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संबंधित प्रश्न
Fill in the blank
_________ refers to the number of atoms in the molecule of an element
Tick (√) the correct alternative from the choice given for the following statement.
Sulphur and carbon are
The important physical properties of substances are colour, odour, nature, density & solubility in water.
Name – two coloured gases (with their colours)
Write the names of elements from the following symbol:
Br
Give an example of two liquids that form heterogeneous mixtures.
Classify the following as elements and compounds.
Water, Common salt, Sugar, Carbon dioxide, Iodine and Lithium
What are elements? What are they made of?
Higher Order Thinking Skills.
In the diagram given below, the circle, square and triangle represent the atoms of different elements.
Identify all combinations that represent
- molecule of a compound
- molecule of an element consisting of two atoms
- molecule of an element consisting of three atoms
An element is sonorous and highly ductile. Under which category would you classify this element? What other characteristics do you expect the element to possess?
Reason out
Elements are called semimetals.
