Chemistry

2. pair is an electron pair in the outermost shell of an atom that is not shared or bonded to another atom.
3. bond a chemical bond between atoms in a molecule having overlapping p orbitals.
6. a series of lines in the visible and ultraviolet spectrum of atomic hydrogen,
7. are atomic species that have the same mass number (A), but a different atomic number (Z).
9. an ideal object that emits all frequencies of radiation with a spectral distribution
10. bond they are formed by head-on overlapping between atomic orbitals.
11. refers to a single packet of matter or energy

1. Decreases down a group but increases across a period enthalpies
4. dot structure gives a pictorial representation of molecular bonding
5. Chemistry which deals with the study of carbon compounds, especially hydrocarbons and their derivatives.
8. bond when two atoms share one or more than one pair of electrons