Periodic table

2. the process of corroding metal, stone, or other materials.
4. the mass of an atom of a chemical element expressed in atomic mass units.
7. They have some properties of metal and some of nonmetal
10. is a fundamental property that quantifies how strongly a given material opposes the flow of electric current.
12. a solid material that is typically hard, shiny
13. able to be drawn out into a thin wire.
16. The elements in a column
17. a table of the chemical elements arranged in order of atomic number
19. able to be hammered or pressed permanently out of shape without breaking or cracking.
20. the periodic table is arranged in rows

1. the elements in groups 3 though 12
3. the state or power of being reactive or the degree
5. a group in the periodic table consisting of the chemical elements
6. they are six chemical elements in group 2 of the periodic table.
8. it is the property of a material to conduct heat.
9. are substance that can conduct electric currents
11. Instead of writing out the name of an element
14. It is an element that lacks most of the properties of metal
15. The elements in group 18
18. a gentle sheen or soft glow, especially that of a partly reflective surface.