In modern periodic table all the elements are arranged in ascending order of__________________?
A. Valency C. Atomic number
B. Atomic mass D. Valence electrons
Submitted by :- Jamil Ahmed
CHEMISTRY
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Elements with similar chemical properties appear in the_________________?
A. Same family
B. Same period
C. p block elements
D. Right upper corner
Submitted by :- Jamil Ahmed
In which of the following pairs are elements belonging to the same group ?
A. Boron & Beryllium
B. Nitrogen & Phosphorous
C. Magnesium & Aluminium
D. Gallium & Helium
Submitted by :- Jamil Ahmed
Amphoteric oxides are those which possess ____________ properties?
A. Acidic
B. Basic
C. Acidic and basic
D. Neutral and acidic
Submitted by :- Jamil Ahmed
Modern periodic table has been divided in ___________ blocks?
A. 2
B. 4
C. 8
D. 7
Submitted by :- Jamil Ahmed
Seventh period contains _________________ normal elements ?
A. 2
B. 4
C. 6
D. 8
Submitted by :- Jamil Ahmed
The longest period in the modern periodic table is___________________?
A. 6th
B. 7th
C. 2nd and 3rd both
D. 5th
Submitted by :- Jamil Ahmed
Noble gases are named so because they are__________________?
A. less reactive
B. Zero group elements
C. Having completely filled valence shell
D. All
Submitted by :- Jamil Ahmed
Which element was not known when Mendeleev proposed his classification ?
A. Hydrogen
B. Sodium
C. Copper
D. Germanium
Submitted by :- Jamil Ahmed
The scientist who did not contribute in the construction of periodic table ?
A. Al-Razi
B. Moseley
C. Dobereiner
D. Democritus
Submitted by :- Jamil Ahmed