The three-digit smallest even number is ……….. .

As we know that Even numbers are the numbers which are divisible by $2$. Ex - : $2,4,6,8,10,12,....$

The three-digit numbers are $100,101,102,..............,999$.

Since $100$ is smallest three- digit number and $100$ is divisible by $2$.

Therefore , the three-digit smallest even number is $100$.