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Chemistry - 9 Chapter - 4
Periodicity of Elements and Periodic Table
Test - 13
1.
Modern periodic table contains ______ groups including zero group.
a) Seven
b) Nine
c) Eight
d) Eight or eighteen
2.
Modern periodic table contains ______ periods.
a) Twelve
b) Eight
c) Seven
d) Six
3.
Modern periodic table has been divided into ______ blocks.
a) Eight
b) Six
c) Four
d) Three
4.
Second and third periods of modern periodic table contain ______ elements each.
a) Six
b) Seven
c) Nine
d) Eight
5.
The present form of the periodic table is called ___________.
a) Modifeid periodic table
b) Modern periodic table
c) Short form of modern periodic table
d) Long form of modern periodic table
6.
Two horizontal rows at the bottom of modern periodic table are part of ________ periods.
a) Sixth and eighth
b) Fourth and fifth
c) Sixth and seventh
d) Eighth and nineth
7.
What is indicated by group no and period in modern periodic table? Short..Answer.......................................................................
Group number indicates no of valence electrons in outermost shell, period number indicates number of electron shells (orbits) in the atom of ------------.
a) that element
b) any element
8.
What is modern periodic table?
Short..Answer…………………………………..
In the modern periodic table, elements have been arranged in ascending order of their atomic numbers so that similar atoms repeat after regular intervals. There are eighteen groups and seven periods in this table. The group number of an element also indicates the number of electrons present in its ---------- shell.
a) innermost
b) outermost
9.
What is the position of metals, non-metals and metalloids in the modern periodic table?
Short..Answer……………………………………..
Metals are present on the left and nonmetals and metalloids on the right side of the periodic table in between them, ------- are present.
a) metalloids
b) Lenthonides
10.
Why lanthanides and actinides are placed separately in modern periodic table? Short..Answer...............................................
a) Actually these elements are part of 6th and 7th period and if placed in these periods, the rows will become very large.
b) Actually these elements are part of 6th and 7th period and if placed in these periods, the rows will become very small.
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