The above pattern is of even numbers.
It follows
2, 4, 6, __, 10, 12...
So, the missing term is also an even number.
Also,
4 - 2 = 2
6 - 4 = 2
12 - 10 = 2
The difference between two consecutive number is 2.
So, the missing term is two less than the number to its right.
i.e., 10 - 2 = 8