ATOMS & Bonding

5. group containing the most reactive non-metals
8. two pairs of electrons shared between two atoms
9. When electrons are _____ between two atoms, a covalent bond is formed
11. In the ____ for an ionic compound, the name of the positive ion is written first
12. A nonpolar _____ is formed when two atoms share electrons equally
15. Ionic compounds that dissolve in water conduct electricity because they break into _____ that move freely
17. A mixture made of two or more elements, at least one of which is a metal
18. Solid metals are good conductors of heat and ______.
20. group of gases which is mostly non-reactive

1. Electrons involved in bonding between atoms
2. Molecular compounds that dissolve in water do not conduct electricity because no _____particles are present.
3. positive metal ions surrounded by freely moving valence electrons
4. Orderly crystal shapes, high melting points, and electrical conductivity when dissolved in water are______ of ionic compounds
6. Na2S
7. property shared by most molecular compounds
10. They form hard, brittle crystals.
13. group containing the most reactive metal elements
14. When an atom loses an electron, it becomes a ____ ion
16. metals can be rolled into thin sheets, as in aluminum foil, or beaten into complex shapes
19. Because the electrons in a molecule of hydrogen fluoride (HF) are more strongly pulled toward the fluorine atom, the molecule is ___.