___ is the number of shells for elements of the 3rd period.
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What is formed when helium atom loses one electron?
Match the following with the correct response.
Who have the power to decide an election petition?
Which among the following is NOT a member of any of the two Houses of the Indian Parliament?
I. Prime Minister of India
II. Finance Minister of India
III. President of India
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.
Elements having same atomic numbers but different mass number are called ______.