JAMB - Chemistry (1991 - No. 11)
The ions X- and Y+ are isoelectronic, each containing a total of 10 electrons.
How many protons are in the nuclei of the neutral atoms of X and Y respectively?
How many protons are in the nuclei of the neutral atoms of X and Y respectively?
10 and 10
9 and 9
11 and 9
9 and 11
คำอธิบาย
X- means one excess electron, hence 9 protons while Y +/- means one deficit electron hence 11 protons X and Y = 9 and 11