How many isotopes does Ruthenium have?

PLEASE??????? I'M BEGGING!!! I NEED IT FOR A PROJECT THAT'S DUE 2MORRO! I CAN'T FIND THE ANSWER ANYWHERE! EVERYTIME I GET DIFFERENT ANSWERS! IF YOU CAN PLEASE HELP AND INCLUDE A LINK? THANK YOU SOOOOOOOOOOOOOOOOOOOOOOOOOO MUCH!!!!