Element Groups
This group contains the least reactive elements
Noble gases
This term refers to the electrons in the outermost shell
Valence electrons
This noble gas is commonly used in balloons
Helium
Rows in the periodic table are known as this
Periods
This term refers to a material made up of only one type of atom
Element
Which shell is closest to the nucleus?
The first shell
Elements with 6 or 7 valence electrons are usually electron _______
Acceptors
This is the most abundant element in the universe
Hydrogen
The atomic number represents the number of these in an atom
Protons
A combination of two or more substances where each retains its own properties
Mixture
These metals are good conductors and have various electron configurations
Transition Metals
Sodium losing an electron to Chlorine forms this compound
Sodium Chloride (table salt)
This element is the building block of organic chemistry.
Carbon
These columns in the periodic table are known as groups OR what else?
Families
Air is an example of this type of mixture
Homogenous mixture
This group typically has 7 valence electrons and is highly reactive
Halogens
Sodium wants to lose its valence electron to become more like this noble gas
Neon
Marie Curie discovered this radioactive element
Polonium or Radium
This scientist is credited with creating the periodic table
Dmitri Mendeleev
Toast burning is an example of this
Chemical change
Calcium and Magnesium belong to this group
Alkaline Earth Metals
This is the maximum number of electrons an atom's second electron shell can hold
8
This metal is often associated with wealth and is highly unreactive
Gold
The number of elements that occur naturally on Earth
92
he term for a substance that has a fixed composition and distinct properties
Pure substance