Periodic Table

2. ___ is attraction for another atom's electrons in a bond
3. atomic radius ___ left to right across a period because more protons pull in with more force
5. ___ energy is attraction for an atom's own electrons
8. elements in the same group have the same number of ___ ___
9. isotopes of ___ are used to generate power
11. isotopes that emit energy from their nuclei are called ___
12. isotopes of the element ___ are used to date once living things
13. ___ have luster, malleability, and are good conductors

1. ___ have some but not all properties of metals
4. allotropes are the same element with different molecular crystal ___ and different properties
6. the number of valence electrons ___ left to right across a period
7. atomic ___ increases down a group because energy levels are added
10. the periodic table is arranged in order of increasing number of ___
12. elements in the same group have similar ___ properties