How many silent consonant does science have?

Let's break down the word "science" to figure out the silent consonants:

* S - This sound is pronounced.

* C - This sound is pronounced.

* I - This sound is pronounced.

* E - This sound is silent because it's at the end of the word and doesn't make a sound.

* N - This sound is pronounced.

* C - This sound is pronounced.

* E - This sound is silent.

Therefore, "science" has two silent consonants: the first and second "e"s.