What is the atomic number of Scandium?
...What is the atomic number of Scandium?
14
21
47
66
Correct answer is B
No explanation has been provided for this answer.
A solid begins to melt when? ...
Which of the following pairs of reagents reat to produce hydrogen? ...
Fluorine does not occur in the free state in nature because ...
Ethanol can easily be produced by ...
The solution of a sample in a tube will be identified as a chloride if it gives...
The oxide from electric power station is ...
Which of the following arrangements is in decreasing order of atomic radius? ...
The constituent of air necessary in the rusting process are ...