This page requires a JavaScript-enabled browser
Instructions on how to enable your browser are contained in the help file.
Chemistry - 9 Chapter - 4
Periodicity of Elements and Periodic Table
Test - 30
1.
Mendeleef changed atomic masses of certain elements to give them proper place in the periodic table.
a) True
b) False
2.
Mendeleef predicted regarding atomic number of undiscovered elements?
a) True
b) False
3.
Mendeleef's periodic table contains ________ periods.
a) 7
b) 9
c) 12
d) 8
4.
Modern periodic Table will not be disturbed if isotopes of an element are discovered now?
a) True
b) False
5.
Numbers of periods in modern periodic table are _______?
a) 9
b) 6
c) 8
d) 7
6.
One element can have different isotopes.
a) No
b) Yes
7.
Periodicity means things with different properties happening after regular intervals.
a) False
b) True
8.
Representative elements or normal elements are different kinds of elements?
a) False
b) True
9.
The elements present in s and p blocks are called _______elements.
a) Transition
b) Metalloids
c) Normal
10.
The group number of an element also indicates the number of electron shells present in the atom of that element?
a) True
b) False
11.
We will have to give more than one place to many elements in periodic table if it was based on atomic masses due to__________?
a) Noble gases
b) Isotopes
c) Radicals
d) Ions
12.
What are valence electrons? Short..Answer............................................... electrons in an ______shell of an atom that can be lost to another atom or shared with another atom to form a molecule.
a) Inner
b) Outer
13.
Why Mendeleef placed nine elements in a special group VIII?
a) Because these were not pure
b) Because there was no suitable place in the table
c) These were not having similar physical properties
14.
Why Mendeleef left certain blank spaces in his table?
a) 1. Answers 2 and 3 are correct
b) 2.To place similar elements in same group
c) 3.To cater for unfound elements
d) 4. To allocate atomic numbers
This is more feedback!
This is the feedback!
