It means it is an ion. It has lost two protons making it a positive ion.
Answer:
Explanation:
This is the Difference Between a Hypothesis and a Theory. In scientific reasoning, a hypothesis is an assumption made before any research has been completed for the sake of testing. A theory on the other hand is a principle set to explain phenomena already supported by data.
2.5X20=50g
50g should be the right answer
Mass=volumeXdenisty.