I have the answers just need a short explanation:)

What are the first three quantum numbers for the electrons located in subshell 2s?

Freezing and boiling are endothermic processes. this means that these processes absorb energy from their surroundings in order to occur. use this information and the data you collected in the phase change gizmo to describe what happens to the temperature of water when you boil it, then explain why this result occurs.

Identify arrows pointing to bonding electrons. done h-0-0-h ) intro