Yes, a number in a ratio must be a whole number.
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Simple whole number ratio implies that ratio of the elements in a compound is a whole number i.e. the ratio of elements bear whole number. For example in Cu2O, Cu and O combine in a simple whole number ratio of 2:1.
It is the ratio of one whole number to another whole number, which may be expressed as a fraction. The ratio (or fraction) may be simplified by dividing both numbers by the greatest common factor.
1:2
Because as a ratio in its simplest form, the denominator is 1.
A rational number can be written as a fraction, with integers in the numerator and the denominator.