Zero.
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no 1 is not an additive identity
The additive inverse of a number is the number with the same magnitude but with the sign changed. It is a number such that the two numbers added together make zero (the additive identity).
The additive identity is zero. When you add a number and 0, the sum equals the original number.
when you add
The additive identity for a set is a number (denoted by 0) such that a + 0 = 0 + a = a for all elements a which belong to the set.