Atoms & The Periodic Table Vocabulary

2. A one- or two-letter abbreviation for an element
3. A tiny, negatively-charged particle that moves around the outside of the nucleus of an atom
9. The basic particle from which all elements are made; the smallest particle of an element that has the properties of that element
11. A term used to describe a material that can be pulled out into a long wire
13. The way a mineral reflects light from its surface
14. A small particle in the nucleus of the atom, with no electrical charge.
16. The number of protons in the nucleus of an atom
18. An arrangement of the elements showing the repeating patter of their properties
19. A substance made of two or more elements chemically combined in a specific ratio or proportion.
20. A horizontal row of elements in the periodic table
21. An atom with the same number of protons and a different number of neutrons from other atoms of the same element
22. An idea that has been studied and investigated and is supported by a vast and diverse array of evidence

1. The ease and speed with which an element combines, or reacts, with other elements and compounds
4. An explanation that is based on information or data given in a chart, table, graph, or other medium
5. To move from one person, place, or object to another without changing form.
6. The electrons that are in the highest energy level of an atom and that are involved in chemical bonding
7. The sum of protons and neutrons in the nucleus of an atom
8. A term used to describe material that can be hammered or rolled into flat sheets
10. A substance that can conduct electric current under some conditions
12. Elements in the same vertical column of the periodic table; also called family
15. The average mass of all the isotopes of an element
17. The central core of an atom, which contains protons and neutrons
20. A small, positively-charged particle that is found in the nucleus of an atom.