Certainly Yes, you can reactivate a Google account that has been deactivated because of 6 months of inactivity. Just do the following to reactivate your account and you are ready to go:

Visit the Google sign-in page.

Enter your email address and tap "Next."

Tap on "Forgot password?" or enter your password if you recall it.

Follow the prompts on the screen to prove your identity and reset your password.

After resetting your password, attempt to log in to your account again.

By doing the above you can enable the account if there is still an issue try getting help from Google's support personnel.

Read more...