Periodic Table

1. __Number: The number of protons in the nucleus of an atom, which is a unique identifier for each element.
3. An element that is malleable, ductile, and an electrical and thermal conductor.
4. __Metals: A group of elements that includes lithium, sodium, potassium, rubidium, cesium and francium.
5. __Number: The total number of protons and neutrons in the nucleus of an atom.
9. A positively charged particle found in the nucleus of an atom.
11. __Earth Metals: A group of elements that includes beryllium, magnesium, calcium, strontium, barium, and radium.
14. A neutral particle found in the nucleus of an atom.
15. __Configuration: The arrangement of electrons in the shells and subshells of an atom.
17. A negatively charged particle found outside of the nucleus of an atom.

2. An element that has properties of both metals and non-metals.
6. The smallest particle of an element that still retains the properties of that element.
7. __Shell: The outermost electron shell of an atom, which contains the electrons responsible for the chemical properties of the atom.
8. A chemical element that is not a metal.
10. __gas: A group of elements that include helium, neon, argon, krypton, xenon and radon.
12. A group of non-metals that include fluorine, chlorine, iodine, bromine and astatine.
13. A vertical column in the periodic table that contains elements with similar properties.
16. A horizontal row in the periodic table that contains elements with similar properties.