What is the atomic number of Actinium?
...What is the atomic number of Actinium?
87
88
89
90
Correct answer is C
No explanation has been provided for this answer.
Which of the following standard conditions is not correct about energy changes? ...
What is the IUPAC name for the following compound? HC≡CCH3...
When ammonium, potassium and calcium carbonates are each separately heated ...
The gas that can best be collected by downward displacement of air is ...
A particle that contains 8 proton, 9 neutrons and 7 electrons could be written as? ...
A dense white fume is formed when ammonia gas reacts with ...