Calcium forms an ion with a positive 2 charge and chlorine forms an ion with a negative one charg, so the formula is <span>CaC<span>l2</span></span>
Group 1 metals and group 2 metals form positive ions by losing 1 and 2 electrons respectively. Non-metals in group 17 gain 1, group 16 gain 2 and group 15 gain 3. Elements which lose electrons form positive ions while elements that gain electrons form negative ions.
To write a formula, you must balance charges so the overall charge is zero. A simple way to do this is to swap the # of the ion's charge and make it the subscript of the other ion. However, leave off the number 1 and reduce to lowest whole number ratio.
They work by lowering the activation energy
Https://www.thoughtco.com/noble-gases-properties-and-list-of-elements-606656
Answer:
Blood type O is the universal donor.
The Universal donor is the only blood type that can donate blood to any other blood group. The universal recipient is the only blood group that can receive blood from any other blood group.
<u>-TheUnknownScientist</u><u> 72</u>