Normal metals like sodium or Calcium have a positive charge as $\ce{Na}^+$ or $\ce{Ca}^{2+}$.

Transition metals have a loot of variable oxidation states.

Yesterday i read about Iridium in Wikipedia and it stated that a +9 oxidation state has been found in $\ce{IrO_4^+}$ which is astounding for me...

So i was thinking can metals have a net negative charged ion also?

According to Google :

Since it is written that metals USUALLY have positive charges which means there may be conditions or compounds when they have negative charges too. Is it possible?

Also can Noble gasses form ions too??

Please Answer! Thanks