Periodic Table and Reactivity Flashcards
The basic unit of a chemical element
Atom
The three basic parts of an atom
Proton, Neutron, Electron
The sum of the protons and neutrons
Atomic mass
Negatively charged subatomic particle
Electron
Subatomic particle located outside the nucleus
Electron
An electron in one of the outer shells of an atom that can participate in forming chemical bonds with other atoms
valence electrons
This determines the element’s reactivity
valence electrons
Arranges all of the known elements in order of increasing atomic number
Periodic Table
This is the same as the number of protons
atomic number
This class of elements is solid at room temperature, shiny, ductile, malleable, and is a good conductor
Metals
This class of elements has no luster (dull), poor conductors, brittle, not ductile, and not malleable
Non metals
This class of elements is the smallest and it is located along the zigzag line on the periodic table. It contains properties of the other two classes
Metalloids
The rows on the periodic table
periods
The elements in the same _________ have the same number of energy levels or shells
period
These are the columns on the periodic table
Groups
