Chapter 5 Test
What are the electrons that have the highest energy level and held the most loosely?
What is a representation of an atom's valence electrons that uses chemical symbols and dots?
electron dot digram
Most atoms are less likely to react with other atoms when they have how many valence electrons?
What is the force of attraction that holds two atoms together as a result of the rearrangement of electrons between them?
As the atomic number increases, what happens to the number of valence electrons?
Halogens are very reactive because they contain how many valence electrons?
The most stable elements in the periodic table are found in the family of?
A group of elements share the same number of?
What is an atom or group of atoms that has an electric charge?
What are ions that are made of more than one atom?
An attraction between two oppositely charged ions(positive and negative) is known as what?
NaCl is an example of what?
A compound that consists of positive and negative ions is called what?
A what tells you the ratio of elements in the compound?
What are properties of ionic compounds?
hard, brittle, solids with high melting points, conduct electric current when melted or dissolved in water
The chemical bond formed when two atoms share electrons is called what?
What is a neutral group of atoms joined by covalent bonds?
What force holds atoms together in a covalent bond?
the attraction of each atom's nucleus for the shared pair of electrons
When two atoms share two pairs of electrons, what is formed?
What is a compound composed of molecules?
When two atoms share three pairs of electrons, what is formed?
A covalent bond in which electrons are shared equally is called a?
A covalent bond in which electrons are shared unequally is called what?
What properties describe molecular compounds?
lower melting and boiling points, do not conduct electric current when melted or dissolved in water
What is an alloy?
a mixture of two or more elements at least one of which is a metal
What is a metallic bond?
an attraction between a positive metal ion and the many electrons surrounding it
Metals are easy to bend because...
metal ions can be pushed out of position
How does an atom become a positive ion?
it loses an electron
How does an atom become a negative ion?
it gains an electron
How is an ionic bond different from a covalent bond?
Ionic bonds transfer electrons. Covalent bonds share electrons.