Which statement best describes the basis of the band theory of metallic bonding? Molecular orbitals overlap to form atomic orbitals in which the valence electrons of the atoms travel. Molecular orbitals overlap to form atomic orbitals in which all electrons of the atoms travel. Atomic orbitals overlap to form molecular orbitals in which the valence electrons of the atoms travel. Atomic orbitals overlap to form molecular orbitals in which all electrons of the atoms travel.

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.