Each family in the periodic table has its own characteristic properties based on the number of ____________.
A mixture that is made of two or more elements--one that is a metal----that has the properties of metal is a(n) ____________________.
Which of the following best describes a metal crystal?
positive metal ions surrounded by freely moving valence electrons.
Water is polar and oil is nonpolar. What happens when the two liquids are poured into the same container?
The liquids do not mix.
Which of the following terms means that metals can be rolled into thin sheets, as in aluminum foil, or beaten into complex shapes?
Magnesium bromide is an ionic compund with the chemical formula MgBr2. What does the "2" tell you?
There are two bromide ions for every magnesium ion.
Which of the following is a characteristic property of ionic compounds?
a. They contain no charged particles
b. They form hard, brittle crystals with characteristic shapes
c. They have low melting points
d. They have low boiling point
b. They form hard brittle crystals with characteristic shapes
If atoms of a halogen nonmetal (Group 17) gain one electron, the atoms then have _____________.
8 valence electrons
Which of the following properties is NOT characteristic of steel?
b. resistant to rust
c. does not readily react with water
d. reacts readily with air
reacts readily with air
True or False: Each family in the periodic table has its own characteristic properties based upon its number of valence electrons.
True or False: The attraction between a positive ion and a negative ion results in a covalent bond.
True or False: When electrons are shared between two atoms, a covalent bond is formed.
False. ionic bond
In an electron dot diagram of aluminum (Al), how many dots should be drawn around the elements symbol? Why? (see diagram)
3 dots because its in Group 3.
List three elements from the group containing the most reactive nonmetals (see diagram).
Chlorine, Florine, Bromine
What strong alloy, containing carbon, iron, and another metal like chromium or nickel, is used to make construction equipment, bicycle frames, and train rails?
True or False: Whan an atom gains an electron it becomes a positive ion.
False. It becomes a negative ion
True or False. Orderly crystal shapes, high melting points, and electrical conductivity when dissolved in water are properties of ionic compounds.
True or False: A nonpolar bond is formed when two atoms share electrons unequally.
False. a polar bond is formed
In the periodic table, atoms are arranged from left to right and from top to bottom in order of increasing ____________.
With the exception of helium, Group 18 elements usually have ___________ valence electrons, so they do not usually react with other elements.
When ions have a positive charge form bonds with ions having negative charge, the charge on the resulting compound is ____________.
Fluorine is a _____________ molecule because the valence electrons are shared equally between the two fluorine atoms.
how many atoms of a Group 17 element would be needed to react with one atom of a Group 2 element? Explain. (see diagram)
2 because it will have to give up both and elements in group 17 only need one more
What is the chemical formula for the compound that forms when sodium and chlorie combine? (see table)