1. Which phrase describes the nucleus of any atom?
1. has an overall positive charge
2. has an overall negative charge
1. an electron and a proton
2. an electron and a positron
3.a neutron and a proton
3. The wave-mechanical model of the atom describes the location of electrons
1. as loosely packed in the nucleus of the atom
2 as densely packed in the nucleus of the atom
3. in circular paths around the atom
4. in orbitals outside the nucleus
4. When a ground state electron in an atom moves to an excited state, the electron
1. absorbs energy as it moves to a higher energy state
2. absorbs energy as it moves to a lower energy state
3. releases energy as it moves to a higher energy state
4. releases energy as it moves to a lower energy state
excited is higher energy
2. Iron conducts electricity.
3. Iron reacts with nitric acid
4. Iron has a high melting point.