Atomic structure true or false?

Homework questions

1. A neutral carbon atom (atomic number = 6) has six electrons located in three different energy levels.  NO.  Carbon has two energy levels, the 1s, and the 2s,2p. The second energy level is further divided into two sublevels.

2. An atom consists of a central nucleus surrounded by electrons that are in constant motion. YES ... depending on your interpretation of an electron and its motion

3. Almost all of the mass of an atom is concentrated in its orbitals. NO.  The mass of an atom is concentrated in the nucleus.

4. The orbital of an electron is the volume of space where the electron is most likely to be found.  YES ... An orbital is a region in the space around the nucleus where there is a high probability of finding two electrons with opposite spin.

5. Almost all of the volume of an atom is empty space.  YES. An atom is mostly empty space.

6. The reactivity or chemical behavior of an atom depends primarily on the number of neutrons it has.   NO ... nonsense

7. Because electrons are attracted to the positively charged nucleus, they have potential energy of position.   YES ... The distance from the nucleus determines the energy of an electron.

8. The first two energy levels of an atom contain two electron orbitals each.   NO.  The first energy level is an s-sublevel.  The second energy level contains one s-orbital and three p-orbitals.

9. Each electron orbital can hold up to two electrons. YES ... An orbital is a region in the space around the nucleus where there is a high probability of finding two electrons with opposite spin.

10. Atoms with unfilled electron orbitals tend to be less reactive. YES ... The inert gases with all the orbitals filled does not react, except for xenon.  Elements like the halogens, with five electrons in the outermost p-sublevel (one half-filled orbital) tend to be reactive.