Chemistry

3. The distance from an atom's nucleus to its outermost electron.
5. A positively charged ion, typically formed by metals losing electrons.
7. An atom or molecule that has a net positive or negative charge due to gaining or losing electrons.
8. Elements that are typically brittle, poor conductors, and tend to gain electrons.
10. Elements in the d-block (groups 3-12) of the periodic table, often forming colored compounds.
11. Elements found in groups 1, 2, and 13-18 of the periodic table.
12. The statement that the properties of the elements are a periodic function of their atomic numbers.
13. The minimum energy required to remove the most loosely bound electron from a gaseous atom.
15. A horizontal row of elements in the periodic table.

1. The energy released when an electron is added to a neutral atom to form a negative ion.
2. The net positive charge experienced by an electron in a multi-electron atom.
4. Elements with properties intermediate between those of metals and nonmetals.
6. Elements that are typically shiny, malleable, ductile, good conductors, and tend to lose electrons.
9. A negatively charged ion, typically formed by nonmetals gaining electrons.
14. A vertical column in the periodic table; elements in the same one have similar properties.