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प्रश्न
Give two examples of the following.
Non-metals which are lustrous
उत्तर
Radium, Graphite
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संबंधित प्रश्न
Write true or false
All pure substances have characteristic melting and boiling points.
Give two examples of the following.
Non-metals which are solids
Define: Formula
Mention three gaseous elements and write their molecular formulae
Indicate whether the following statement is true or false:
Molecules combine to form atoms
The important physical properties of substances are colour, odour, nature, density & solubility in water.
Name – a gas with a pungent, choking odour which is lighter than air
Draw a labelled diagram of an atom including its nucleus, orbits & their contents.
Select the correct answer from the choice given below.
An impure substance
Select the correct answer from the choice given below.
A group of atoms of elements
‘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.
