Why is there no zero positive and negative number?

Q) Why is there no zero positive and negative number?

Answer

If x is a positive number, then its negative or opposite number is -x

Sum of a number and its negative number is always zero, 0

x + (-x) = x - x =0

So we see that a positive number and an equally negative number cancel out each other giving a result as Zero. 

There is nothing positive or negative about zero.

Zero is just zero. It is NEITHER positive NOR negative.

To the right of zero on number line are positive numbers and on the left of zero, lie the negative numbers on the number line.