Class 9 Chemistry MCQ
The atomic radil of the elements in periodic table:
increase form left to rightxa0 in period
increase form top to bottom
do not change form left to right in period
decrease form top to bottom in a group
……………….. of an atom is not fixed.
Size
Mass
Electronegativity
Nuclear char
Mendeleev periodic table was based upon the:
electronic configuration
atomic mass
atomic number
completion of a subshell
The 2nd and third periods are called
short period
Normal period
Long period
Very long period
The elements of group 3 to 12 are called
Normal elements
Transition elements
Radioactive elements
None of these
The other name of modern periodic table is ________________ of periodic table.
Long form
Simplified
Simplest
Nil
The no. of periods in modern periodic table are
7
11
18
23
Group runs from ________________
Top to bottom
Left to right
Top to right
Bottom to left
The repetition of a property after a certain interval is:
Periodicity
Properties
Periodicity of properties
None
The no.of electrons in the valence shell of noble gases is
1
6
7
8
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