Which electrons of an atom are involved in forming bonds?
it becomes a positive ion
What happens to an atom that has lost one or more electrons?
How is the chemical formula for an ionic compound written?
there are 2 parts - the positive ion (positive electrical charge) and the negative ion ( negative electrical charge) -these 2 oppositely charged ions are held together in an ionic bond. The positive ion is usually a metal; the name of positive ion comes first followed by name of negative ion. The negative ion is a single element and the end of its name changes to IDE. If the negative ion is polyatomic, its name usually ends in ATE or ITE
What holds together an ionic compound?
Positive ions are usually what?
How does the name of a negative single element end?
How does a negative ion that is polyatomic end?
ATE or ITE
What is a subscript?
a number in a chemical formula that tells the number of atoms in a molecule or the ratio of elements in a compound
these are also known as covalent compounds and are composed of non metal molecules (end in -ide)
Properties of molecular compounds
lower melting points than ionic lower boiling points than ionic and do not conduct electricity when dissolved in water or melted
What are polyatomic ions?
ions that are made of more than one atom
What is a double bond?
a covalent bond in which two atoms share two pairs of electrons
Which group of elements on the periodic table are considered the most reactive elements?
alkali metals and halogens
What are alloys?
a mixture composed of two or more elements, at least one of which IS a metal
What is a triple bond?
a covalent bond in which three pairs of electrons are shared by two atoms
What are the properties of ionic compounds?
hard, brittle crystals with a HIGH melting and boiling point that conduct electricity when dissolved in water.
Why do ionic compounds conduct electricity when dissolved in water?
electric current is the flow of charged particles; when ionic crystals dissolve in water, the ions broken apart - this allows them to be able to move freely about in the solution
What does it mean to say metals are malleable?
they can be rolled into thin sheets or beaten into complex shapes
Why won't molecular compounds dissolved in water conduct electricity?
no charged particles within the compound
What is the difference between polar bonds and nonpolar bonds?
polar bonds share electrons unequally while nonpolar share electrons equally
How would you describe a metal crystal?
composed of closely packed, positively charged metal ions; the valence ions in it DRIFT among all the ions in the bond (positive metal ions "swimming" in a pool of MOVING valence electrons
What are the MOST reactive NONMETALS?
What type of bonds form between 2 nonmetals?
What is a Covalent bond?
a bond between atoms that SHARE electrons
What is an ionic bond?
a bond between atoms that TRANSFER one or more electrons
What are the properties of solid metals?
Malleable, shiny, ductile and good conductors of heat and electricity
What group and number do Alkali metals belong to?
What group and number do Alkaline earth metals belong to?
What group and number does the Boron Family belong to?
What group and family do Halogens belong to?
What group and family do Noble Gases belong to?
What charge does an ionic compound have?
Why does an ionic compound have a neutral charge?
when the positive ion joins with the negative ion, the two charges cancel each other out
How many atoms of group 17 element would be needed to react with one atom of a group 1 element?
only 1 (one ion would balance the charge when joined with this group)