1. C
2. B
3. B
4. sorry, but we cant see the pictures. thats all I can do.
-Chad
Carbon+oxygen= carbon dioxide
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
Answer:
it is a device to control self sustained nuclear reactions. they are used at nuclear power plants for electricity generating and nuclear marine propulsion.