MNDs and Main Families

4. destroy or wear away gradually by chemical action
6. located to the right of the staircase
7. easy to shape, mold, or flatten
11. a material's ability to allow heat or electricity to pass through it
12. highly reactive; pungent
14. lacking luster; absorbs light
15. rows on the periodic table
17. fragile; not strong; easily damaged
18. highly reactive; very soft
19. part of the element square that shows the number of protons and electrons an element has

1. part of the element square that shows the sum of protons and neutrons an element has
2. stable; odorless and colorless; found in our atmosphere
3. has the conductivity between a conductor and an insulator; property of metalloids
5. reactive; found in nature, but not "freely"
8. capable of being pulled or drawn into a wire
9. located to the left of the staircase
10. strong odor; smells bad
13. how well light reflects off a surface
16. columns on the periodic table
20. located along the staircase