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Question1) Matter around us is present in the form of elements, compounds and mixtures.
Option- ['True', 'False']
Answer: True
Explaination: Elements are substances containing atoms of only one type. Eg., Na, Mg, Au etc.
• There are 118 elements known to us. All these have different properties
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Question2) When elements were arranged in the order of increasing atomic masses, groups of three elements
Option- ['True', 'False']
Answer: True
Explaination: When elements were arranged in the order of increasing atomic masses, groups of three elements (known as traids), having similar chemical properties are obtained.
The atomic mass of the middle element of the triad was roughly the average of the atomic masses of the other two elements.
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Question3) John Newland arranged the known elements in the order of decreasing atomic masses.
Option- ['True', 'False']
Answer: False
Explaination: John Newland arranged the known elements in the order of increasing atomic masses and found that the properties of every 8th element are similar to that of the 1st element
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Question4) There is no limitations of newland's law of octave.
Option- ['True', 'False']
Answer: False
Explaination: The limitations of newland's law of octave
It was applicable upto Calcium (for lighter elements only).
• Properties of new discovered elements did not fit into the law of octave.
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Question5) Dmitry Mendeleev, a Russian chemist in 1869 gave Mendeleev’s Periodic Table.
Option- ['True', 'False']
Answer: True
Explaination: Dmitry Mendeleev, a Russian chemist in 1869 gave Mendeleev’s Periodic Table.
• Till then 63 elements were known.
• He observes the relationship between the atomic masses of the elements and their physical and chemical properties
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Question6) Mendeleev observes the relationship between the atomic masses of the elements and their physical and chemical properties.
Option- ['True', 'False']
Answer: True
Explaination: Mendeleev observes the relationship between the atomic masses of the elements and their physical and chemical properties
• It includes 7 periods and 8 groups but inert gases were missing in his table.
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Question7) Mendeleev arranged elements in increasing order of their atomic mass.
Option- ['True', 'False']
Answer: True
Explaination: Mendeleev arranged elements in increasing order of their atomic mass.
• He puts elements with similar properties in a group.
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