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Chemistry - 9 Chapter - 4
Periodicity of Elements and Periodic Table
Test - 20
1.
Period number of an element shows the ______?
a) Total number of electrons
b) Toral no of proton
c) Total number of electron shells
d) Total no of neutron
2.
Seventh period contains elements with atomic numbers 87 to 109.
a) False
b) True
3.
Sixth period contains _________ elements.
a) Five
b) Eighteen
c) Sixteen
d) Thirty trwo
4.
Which elements are called actinides?
a) Elements with atomic number 93 to 103
b) Which follow actinide 89 in ___ period
5.
Which elements are called lanthanides? Short..Answer............................................... Lanthanides are elements with atomic number 58 to 71, which follow lanthanum in_____period.
a) 6
b) 5
c) 6
d) 6
6.
Why d-block elements are called outer transition elements? Short..Answer...........
a) Because electrons are gradually added in 3d orbital of penultimate shell of these elements
b) Because electrons are gradually added in 3d orbital of penultimate shell of these items
7.
Elements of s and p block are called representative elements?
a) True
b) False
8.
If a new element is discovered, and if this resembles noble gases, what would be its possible atomic number?
a) 118
b) 120
c) 117
d) 119
9.
Inner transition elements are contained in _____ block.
a) f
b) s
c) d
d) p
10.
Lanthanides and actinides are called f-block elements or inner transition elements.
a) False
b) True
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