The sum of the number of protons and neutrons in the nucleus of an atom is called the

Carbon has an atomic number of 6. What can you conclude about carbon from this fact?

Which term is defined as the sum of protons and neutrons in an atom?

In an electrically neutral atom the number of protons in the nucleus is equal to the number of?

Sodium's atomic number is 11. What does this tell you about an atom of sodium?

In which of these cases do we have enough information to say that the atom is electrically neutral?

The atomic number of krypton (Kr) is 36, and its mass number is 84. How many neutrons does it have?

The center of an atom is a dense region consisting of protons and neutrons called the