Periodic Properties and Variations of Properties - Physical and Chemical
ICSE · Class 10 · Chemistry
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See them allWhat is periodicity?
Answer
The periodic repetition of elements having similar properties after regular intervals is called periodicity.
State Mendeleev's Periodic Law.
Answer
The physical and chemical properties of the elements are periodic functions of their atomic weight given by Mendeleev.
State Modern Periodic Law.
Answer
The physical and chemical properties of the elements are the periodic functions of their atomic numbers.
How are elements arranged in the modern periodic table?
Answer
The Modern periodic table arranges elements in increasing order of atomic numbers. It has seven periods and eighteen groups.
Which elements are called noble gases?
Answer
He, Ne, Ar, Kr, Xe and Rn are noble gases. They are Group 18 elements with completely filled shells and are practically unreactive under normal conditions.
Which elements are called representative elements?
Answer
Elements of Groups 1, 2, 13, 14, 15, 16, 17 and 18 are called representative elements. They are also called normal elements.
Which elements are s-block elements?
Answer
Elements of Group 1 and Group 2 are s-block elements. Group 1 elements are alkali metals and Group 2 elements are alkaline earth metals.
Which elements are p-block elements?
Answer
Elements of Groups 13 to 18 are p-block elements.
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