Chemistry

2. A vertical column in the periodic table of the elements.Elements in a group have similar properties.
4. An element that has properties of both metals and nonmetals
7. A table of the elements, arranged by atomic number, that shows the patterns in their properties.
8. An atom of one element that has a different number of neutrons than another atom of the same element.
10. The number of protons in a nuclear of an atom.
12. A particle that has no electric charge, and is located in an atom's nucleus.
14. The central region of an atom where most of the atom's mass is found in a proton and neutron.
16. an atom's nucleus

1. An element that is not a metal and has properties generally opposite to those of a metals.
3. 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.
5. A horizontal row in the periodic table of the elements. Elements in a period have varying properties
6. The total number of protons and neutrons
9. A positively charged particle in an atom's nucleus.
11. An element that tends to be shiny, easily shaped, and a good conductor or electricity and heat.
13. An atom or group of atoms that has a positive or negative charge
15. A negatively charged particle located outside an atom's nucleus. An Electron is about 2000 times smaller than either a proton and neutron.