Lesson 1
What type of electrons are involved in bonding between 2 atoms?
valence electron
What kind of bond is formed when electrons are transferred between two atoms?
ionic bond
A chemical bond formed when two atoms share electrons is called a(n)
covalent bond
Name at least 3 properties of metals?
Good thermal conductor, good electrical conductor, ductile, luster, malleable
Which group on the Periodic Table contains the most reactive elements?[ You must say the Group Name, not the number.)
the alkali metals
Magnesium bromide is an ionic compound with the chemical formula MgBr2. What does the “2” tell you?
A. There are two bromide ions for every magnesium ion.
B. Bromide has a 2- charge.
C. Bromide has a 2+ charge.
D. There are two magnesium ions to every bromide ion.
A. There are two bromide ions for every magnesium ion.
A low melting point describes what type of compound?
molecular compound
At room temperature, most metals are
solid
What makes an ion positive?
Orderly crystal shapes, high melting points, and electrical conductivity when dissolved in water are properties of what type of compounds?
ionic compounds
What type of bond is formed when two atoms share electrons unequally?
Polar bond
Metals typically have _______ melting points.
high
What is the chemical name for the compound with the formula Na2S?
Sodium Sulfide
Ions that are made of more than one atom are examples of
polyatomic ions
What is it called when two pairs of electrons are shared between two atoms
a double bond
What type of bonding involves an attraction between positive ions and electrons?
metallic bonding
What compounds form hard, brittle crystals.
ionic compounds
In the chemical formula for an ionic compound, which item is written first?
the name of the positive ion. (Or the Metal)
Ionic compounds are electrically
Neutral
Why are alloys generally used to make everyday objects?
Alloys are often strong and less reactive than pure metals.