Unit 4- Electrons & Periodic Table Vocabulary

the sum of the protons and neutrons in an atom

• period
• atomic number
• proton
• mass number

negatively charged ion formed by gaining electrons

• anions
• atoms
• isotopes
• cations

the mass of an atom as listed on the periodic table

• mass number
• atomic mass
• atomic number
• protons

smallest particle of an element that retains the properties of the element

• electron
• proton
• atom
• ion

center of an atom

• nucleus
• electron
• proton
• neutron

another name for a group of elements on the periodic table

• group
• family
• period
• halogen

elements located along the "stairs" on the periodic table

• metals
• nonmetals
• metalloids
• transition metals

elements that are shiny, solids and good conductors of heat and electricity

• metals
• nonmetals
• metalloids
• transition metals

another word for state of matter

• period
• phase
• proton
• positive

family of elements located in group 1 on the periodic table

• noble gases
• halogens
• alkali earth metals
• alkali metals