Answer:
Physical
Explanation:
Olive oil, vinegar, salt, and pepper are shaken together to make salad dressing. Physical or chemical change?
Physical
Answer: Heterogeneous Mixture
Explanation:
The mass number of an atom is the sum of its protons and neutrons. the most common isotope of argon is ar-40 (40 ar), with a natural abundance of 99.6 %. the mass number for ar-40 is 40 . It is having 18 protons and 22 neutrons. So its mass number is 40 that is equal to sum of total number of protons and neutrons.
Mass number=total number of protons and neutrons
=18+22
=40