Which of the following ions has an electron configuration...
Which of the following ions has an electron configuration different from the other?
17CI-
8O2-
12Mg2+
13AI3+
Correct answer is A
17Cl− = 18 electrons = 2, 8, 8
12Mg2+, 8O2− and 13Al3+ all have 10 electrons = 2, 8.
An element, X, forms a volatile hydride XH3 with a vapour density of 17.0. The relative atomic ...
In the diagram above, Y is a mixture of ...
A substance is said to be impure if ...
Certain useful waxes are composed mainly of ...
The high solubility of ethanol in water is due to its ...
Which element is the most electronegative? ...
When sodium reacts with water, the resulting solution is ...