Periodic table

2. -A material that conducts heat or electricity, which means electrons can easily flow through the object.
3. -is an element or substance that conducts heat and electricity, is malleable and ductile, and has low ionization energy and low electronegativity values.
6. -a vertical column (up and down) on the periodic table.
8. -an element that has some properties of a metal and some properties of a nonmetal.
11. -the number of protons contained in each nucleus of its atoms of the element.
13. -Group 18 elements on the periodic table that contain 8 valence electrons
15. -Group 17 nonmetals on the periodic table that contain 7 valence electrons.
16. -a one or two-letter symbol that represents the element.
17. -Group 1 metals on the periodic table that contain 1 valence electron and lose their valence electrons the most easily, making them the most reactive metals.
19. -electrons that are located in the outermost energy level of an atom.
20. -describes how likely an element is to form bonds with other elements.

1. -an element that does not conduct electricity or heat and is usually a gasmetalloid re.
4. -the average mass of an atom of an element.
5. -the smallest unit of an element that has all of the properties of the element; basic building block of matter.
7. -a horizontal row (left to right) in the periodic table.
9. -the number of protons and neutrons in the nucleus of one atom of the element.
10. -elements and/or compounds that when put together are unable to react chemically.
12. -Group 1 metals on the periodic table that contain 2 valence electrons and are the second most reactive metals.
14. -an atom that has gained or lost one or more electrons.
18. -the principle that the properties or characteristics of the elements recur periodically as their atomic numbers increase.