Use the periodic table from the lesson to answer the following question. the atomic mass of f is

answer: you could do some invislibe ink.

explanation: i will tell you how to if u answer my question.

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.

it's c. elements are placed in rows based on how may valencies electrons have.

the objects have the same charge is correct.

nathan lee