What is the atomic mass number of carbon-13 (6 protons, 7 neutrons, 6 electrons)?

An uncharged atom has six electrons. The nucleus of this atom must contain _______ protons.

For Al, its atomic number is 13 and its mass number is 27. How many neutrons does it have?

If an atom contains 3 protons, 4 neutrons, and 3 electrons, its mass number is

On a dry day, your body can accumulate static charge from walking across a carpet or from brushing your hair. If your body develops a charge of -22 µC (microcoulombs), how many excess electrons has it acquired?

Determine whether each of the following statements is true or false. c. The number of electrons in an atom equals the number of neutrons in the atom.