78 protons and 55 elections
55 protons and 78 neutrons
55 neutrons 78 electrons
78 protons and 55 neutrons
Correct answer is B
No explanation has been provided for this answer.
The ores that can be concentrated by flotation are ...
Which of the following hydrocarbons is mainly used as fuel? ...
Which of the following noble gases is commonly found in the atmosphere? ...
A liquid that will dissolve fat is ...
The products of the electrolysis of dilute sodium chloride using carbon electrodes are Anode Cath...
How many grams of bromine will be required to completely react with 10 g of propyne? (C = 12, H =...
Which of the following molecules is linear in shape?...
Which of the following is used in the manufacture of bleaching powder? ...