# science

if barium ions have a charge of 2= nd hydroxide ions have a charge of 1-, the compound calcium is what?

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1. what dose porosity mean?

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2. First, if you have a question, it is much better to put it in as a separate post in <Post a New Question> rather than attaching it to a previous question, where it is more likely to be overlooked.

Since this is not my area of expertise, I searched Google under the key words "porosity" to get these possible sources:

In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.

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