No it can't.
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It is zero. The number 02 is a number. It is a concept and no physical existence and no mass. So the mass percentage is zero.
Depend on what exactly do you mean by 'common'. On one hand there are countless photon everywhere which has zero mass. But if you mean everyday objects, then zero weight of cause (free fall, space etc), as I don't think zero mass is even attainable at this scale.
A hole, by definition, has nothing in it and so its mass is zero.
Galileo was the first to discover that, when released at the same time, objects with different weights will reach the ground at the same time. This is true because the Earth's gravitation pull is constant. Generally speaking, the velocity of an object will initially be low (zero) and will, given time and distance, increase to reach its terminal velocity. Mass, on the other hand, will remain constant.
In terms of atomic mass, the atom with a zero value is the neutron, as it has a mass close to zero. However, in terms of atomic charge, an atom with a zero value is a neutral atom, meaning it has an equal number of protons and electrons canceling out their charges.