if barium ions have a charge of 2= nd hydroxide ions have a charge of 1-, the compound calcium is what?
It seems like you may have made a mistake in the question. Barium ions typically have a charge of 2+, not 2=, while hydroxide ions have a charge of 1-. The compound that forms when these ions combine is barium hydroxide.
To determine the compound formed between barium ions (Ba^2+) and hydroxide ions (OH^-), we need to consider their charges and the principle of charge balance. Since the barium ion has a charge of 2+ and the hydroxide ion has a charge of 1-, we can combine them in a 1:2 ratio to achieve charge balance.
In this case, the formula for barium hydroxide will be Ba(OH)2. The barium ion (Ba^2+) with a charge of 2+ will combine with two hydroxide ions (OH^-), each having a charge of 1-, to maintain the overall neutrality of the compound.
So, the compound you are referring to is barium hydroxide (Ba(OH)2) and not calcium.