Science Test 4.2
K2S
A potassium ion has a charge of 1+. A sulfide ion has a charge of 2−. What is the chemical formula for potassium sulfide?
ion
A(n)___________is an atom or group of atoms that has an electric charge.
high
Because the force of attraction between the positive and negative ions is so strong, ionic compounds have___________melting points.
equal
In an ionic compound, the total positive charge of all the positive ions_____________ the total negative charge of all the negative ions.
lose
In order to have a stable arrangement of 8 valence electrons, metal atoms are likely to___________electrons.
lose
In the formation of an ionic compound, a metal atom is most likely to___________valence electrons.
opposite charges
Ionic bonds form between two ions that have
opposite
Ionic compounds form because__________charges attract.
magnesium oxide
Name the following compound: MgO.
gain
Negative ions form when atoms__________valence electrons.
ionic bond
The attraction between oppositely charged ions is called a(n)_____________.
hard, brittle crystals high melting point conducts electricity when dissolved in water or melted
What are properties of ionic compounds?
metals and nonmetals (metals give, nonmetals take)
What groups form ionic bonds?
8
What number allows an ion to become stable?
an element from Group 17
Which is most likely to form a negative ion? A an element from Group 17 B a metal C an element from Group 1 D an element with atoms that have eight valence electrons
magnesium chloride
Which of the following is the correct name for MgCl2? A magnesium chlorine B magnesium dichlorine C magnesium chloride D magnesium dichloride
ions
__________forms when neutral atoms gain or lose electrons.
ionic compound
a chemical compound comprising ions held together by electrostatic forces termed ionic bonding
ion
an atom or group of atoms that has become electrically charged
polyatomic ion
an ion that is made of more than one atom
chemical formula
symbols that show the elements in a compound and the ratio of atoms
ionic bond
the attraction between oppositely charged ions
