Chemistry Vocabulary

4. The length of time it takes for half of the atoms in a sample of a radioactive element to decay into atoms of another element
7. An element that is not a metal and has properties generally opposite to those of a metal
9. An element that tends to be shiny, easily shaped, and a good conductor of electricity and heat
10. The central region of an atom where most of the atom’s mass is found in protons and neutrons
11. A particle that has no electric charge and is located in an atom’s nucleus
12. A vertical column in the periodic table of the elements
14. A table of the elements, arranged by atomic number, that shows the patterns in their properties
15. An atom or group of atoms that has a positive or negative electric charge

1. A horizontal row in the periodic table of the elements
2. A negatively charged particle located outside an atom’s nucleus
3. The total number of protons and neutrons in an atom’s nucleus
5. The number of protons in the nucleus of an atom
6. An element that has properties of both metals and nonmetals
8. An atom of one element that has a different number of neutrons than another atom of the same element
13. A positively charged particle located in an atom’s nucleus