I feel like it is important, because it is always nice to learn about new things and keep your mind open, to expand your knowledge.
Answer:
This one represents calcium atoms that have lost two electrons >>Ca+2
In addition to content, elements also support attributes <span>that specify the use, the behavior, and in some cases the appearance of an element.
The other options just do not fit the blank in this question, which is why the word <em>attributes </em>is the correct one to choose here.</span>
This the answer for you hope it work out for you
A)pure water contains equal amount of hydroxide and hydronium ion