Periodic Table

2. electrons / an electron in the outer most energy level of an atom
4. / the elements that are good conductors of heat and electricity
6. / the elements that are usually poor conductors of heat and electricity
8. / the smallest particle that has the properties of an element
10. / a negatively charged subatomic particle found in the energy level of an atom
13. / a horizontal row in the periodic table of elements that have varying properties
14. / when an atom lose or gain electrons
15. Level / any of the possible energies an electron may have in an atom

1. number / the total number of protons and neutrons in the nucleus of an atom
3. / a neutral subatomic particles in the nucleus of an atom
5. number / the number of protons in the nucleus of an atom
7. / an element that has properties of both a metal and non-metal
9. / a positively charged subatomic particles in the nucleus of an atom
11. / the center of an atom, made up of protons and neutrons
12. / a vertical column in the periodic table of elements that have similar properties