Answer:
To tell if something is an acid or a base, you can use a chemical called an indicator. An indicator changes color when it encounters an acid or base. There are many different types of indicators, some that are liquids and others that are concentrated on little strips of "litmus" paper.
Explanation:
Calcium, which is in Period 2 and has 2 valence electrons, has an ion of Ca 2+
This is because it can give up the two electrons to get a full outer shell.
Nitrogen, on the other hand, has 5 valence electrons. To get a full outer shell, it can either gain 3 electrons or lose 5. Since it is easier to gain 3, Nitrogen usually gains 3 electrons to form a N3- ion.
Even though it is rare, it is possible for Nitrogen to form a positive ion, which is N5+
Hope I helped!! xx
There are 453.592 grams in a pound.
I believe the answer is 1,2, and answer 5 is correct.Hope this helps
