1
When an atom loses an electron, it becomes a
Positive ion.
Two pairs of elections are shared between two atoms is called a
Double bond
Electrons that are involved in bonding between atoms are called
Valence Electrons
The properties of solid metals can be explained by the __________________ of and the bonding among the metal atoms.
structure
Ionic compounds that dissolve in water conduct electricity because they can break into ___________ that move freely.
Ions
What property shared by most molecular compounds?
Low melting point
Solid metals are good conductors of heat and ______________.
Electricity
This refers to metals being rolled into thin sheets, or beaten into complex shapes.
Malleability
The ______________ metals contain the most reactive elements.
The chemical name for the compound with the formula NaS is
Sodium Sulfide
A _____________ bond is formed when two atoms share elections unequally.
Polar
In a chemical formula, the name of the ______________ ion is written first.
positive
A mixture of two elements, one of which is a metal is called an ______________.
Alloy
When electrons are shared between two atoms, a __________________ bond is formed
Covalent
Because the electrons in a molecule of hydrogen fluoride (HF) are more strongly pulled toward the fluorine atom, the molecule is ______________.
Polar
Molecular compounds that dissolve in water do not conduct electricity because no _____________________________ are present.
charged particles
Orderly crystal shapes, high melting points, and electrical conductivity when dissolved in water are properties of _____________ compounds.
Ionic
A low melting point is one property of _____________ compounds.
molecular
A metal crystal consists of positively charged metal ions embedded in a "sea" of freely moving _________________________.
Valence Electrons
Magnesium bromide is an ionic compound with the chemical formula MgBr2. What does the "2" tell you?
There are two bromide ions for every magnesium ion.
Explain how bonds form between sodium and chlorine in sodium chloride (NaCl).
Na has 1 valence electron and Cl has 7 valence electrons. Na transfers one electron over to Cl causing a bond.
How do valence electrons relate to the chemical reactions of an element?
Valence electrons are used in chemical reactions and get shared or transferred during reactions.
Compare a covalent bond and an ionic bond.