Mervin Ruiz

1. /a subatomic particle with a neutral charge located in the nucleus of an atom and has a mass of 1 amu (atomic mass units).
4. /elements in Group 1 on the periodic table. These are very reactive metals, which readily lose their 1 valence electron to form ionic compounds with nonmetals.
6. /a negatively charged ion due to gaining 1 or more electrons.
8. /a subatomic particle with a positive charge located in the nucleus of an atom and has a mass of 1 amu (atomic mass units).
10. /the average mass of all the different isotopes that make up the element. The average is calculated using the relative abundance of isotopes in a naturally occurring element.
11. /a horizontal row on the periodic table. Elements in the same period have the same number of total energy levels but do not have similar characteristics.
12. /a table of the chemical elements arranged in order of atomic number so that elements with similar chemical properties appear in vertical columns
14. /a subatomic particle with a negative charge located orbiting around the nucleus within the electron cloud and has a mass of 1/1840 amu (atomic mass units).

2. /elements in Group 18 on the periodic table. These nonmetals are considered stable, nonreactive inert gases because they have full valence shells.
3. /atoms that have the same number of protons but different numbers of neutrons.
5. /an electrically charged atom due to losing or gaining 1 or more electrons.
6. /a unit of matter, the smallest unit of an element, having all the characteristics of that element and consisting of a dense, central, positively charged nucleus surrounded by a system of electrons.
7. /elements in Group 2 on the periodic table. These are also reactive metals, although not as reactive as alkali metals.
9. /the number of protons in an atomic nucleus.
13. /a positively charged ion due to the loss of 1 or more electrons.