NEED HELP! thank you! The same element is present before and after a
O chemical change
O physical change
O chemical reaction
O none of these

Identify one disadvantage to each of the following models of electron configuration: dot structures arrow and line diagrams written electron configurations type in your answer below.

What overall charge must all compounds have

In an investigation that uses the scientific method, which step immediately follows making a hypothesis? o summarizing the results o asking a question o making observations designing an experiment mark this and retum save and exit next submit