Answer:b
Explanation: If you look at the line on the graph, you can see that it is going downward, meaning it has a negative slope, and choice b is the only one that has a negative slope
Answer D. The pitch is in the frequency.
naturally occurring radioactive elements have been around since the Earth's formation
Answer:
D) Number of electrons.
Explanation:
Elements in the same group on the periodic table has the same number of electrons. These electrons are those involved in bonding with other atoms to form compounds.
