Elements having same atomic numbers but different mass number are called ______.
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An electron loses potential energy when it
Plaster of Paris ______.
I. changes into gypsum on mixing with water
II. is CaSO4.2H2O
III. is used for decoration
The process of transferring of charge from a charged object to the earth is called ______________.
What is the position of metallic ion and non-metallic ion in a chemical formula?
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
The movement of water molecules through the plasma membrane is called ______.
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