Answer :
There are two cases in this problem :
1). When the ion is positively charged :
Now, the ion and the substance both are positively charged hence when brought together will repel each other because equal charged particles repel each other.
2). When the ion is negatively charged
Now, the substance is positively charged and the ion is negatively charged so both will attract each other because the particles with opposite charges attract each other.
Any number that you can write down on paper ... with digits, a fraction bar,
and a decimal point ... is a rational number.
If it uses only digits, then it's an integer. If it needs a fraction bar or a decimal
point, then it's NOT an integer. But if you can write the whole thing on paper,
without any other symbols or comments, then it's a rational number.
