Question | Answer |
when an atom loses an electron | it becomes a positive ion |
each family in the periodic table has its own characteristic properties | based on the number of valence electrons |
an ionic bond is the attraction between | oppositely charged ions |
polyatomic ions | ions that are made of more than one atom |
ionic compounds | form hard, brittle crystals with characteristic shapes |
ionic compounds conduct electricity | when dissolved in water |
covalent bond | a chemical bond formed when two atoms share electrons |
a double bond | two pairs of electrons shared between two atoms |
s property shared by most molecular compounds | low melting point |
molecular compounds do not conduct electricity | because they do not break up into ions |
a covalent bond in which electrons are shared unequally | is polar |
in a chemical formula for an ionic compound | the positive ion is written first |
electrons involved in bonding between atoms are | valence electrons |
the greatest number of valence electrons an atom can have is | 8 |
what happens when water and oil are poured into the same container | the liquids do not mix |
ionic compounds are | electrically neutral |
malleable | means that metals can be rolled into thin sheets or beaten into complex shapes |
alloy | a mixture that is made of two elements, one that is a metal, and has the properties of metal |
ad advantage of alloys over pure metals | alloys resist rust |
steel is an alloy combined with | iron |
examples of alloys | brass and steel |
a metal crystal | positive metal ions surrounded by freely moving valence electrons |
ductile | means that metals can be pulled into thin strands or wires |
metallic bond | the attraction between a positive metal ion and the electrons surrounding it |
a strong alloy containing carbon, iron, and another metal like chromium or nickel used to make construction equipment is | steel |
steel | has strength, is resistant to rust, and does not readily react with water |
valence electrons | shown on electron dot diagrams, transferred or share in bonding, and are loosely held by the nucleus |