JAMB - Chemistry (2001 - No. 3)
A particle that contains 9 protons, 10 neutrons and 10 electrons is a
negative ion
positive ion
neutral atom of non-metal
neutral atom of a metal
คำอธิบาย
If it were a neutral atom,the number of proton would have been equal to number of electron = 9 each
However, since the number of electrons is by 1 greater than that of proton, and since electrons having more number than proton are negatively charged, the particle must be a negative ion.