Elements having same atomic numbers but different mass number are called ______.
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Which among the following statements are TRUE regarding synthetic fibre?
I. They melt after catching fire.
II. They are more durable.
III. They are prepared by a number of processes using petrochemicals.
The process of transferring of charge from a charged object to the earth is called ______________.
Plaster of Paris ______.
I. changes into gypsum on mixing with water
II. is CaSO4.2H2O
III. is used for decoration
An electron loses potential energy when it
Valency of an element depends on which of the following?
I. Number of losing electron
II. Number of gaining electron
III. Number of sharing electron
The vast amount of sea weeds present in oceans may produce an endless source of
What is the position of metallic ion and non-metallic ion in a chemical formula?
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