An atom with 19 protons and 18 neutrons is a(n) A. Isotope of argon (Ar)
B. Standard atom of (K)
C. Standard atom of agron (Ar)
D. Isotope of potassium (K)

How do we measure or think of speed in the united states?

How does an observation about an object differ from an inference about that object

What would people living along the coast in south florida do if there was a hurricane warning? move to locations away from the water flock along coasts to watch the natural phenomenon buy instruments to predict the exact location of the hurricane measure water levels to know the exact time of the hurricane