Oxidation state is +2 Coordination number is 6 Not sure how you'd name it - but I'm guessing Tetraaquadichloronickel (ii) Although don't quote me on that
Once again, I've merged all of your threads into one big thread. Please don't post a new thread for each question you have when all of them are on the same topic and are so similar.
As an aside, you might get a more positive response if you try and do some of the work yourself rather than just asking everyone to do it for you.