Chapter 20 science
Double bond
2 pairs of electrons are shared (a total of four electrons)
Ion
A bond formed by the attraction between oppositely charged ions? (usually a metal and a nonmetal)
Covalent bonds
A bond formed when atoms share one or more pairs of valence electrons to attend a noble-gas electron configuration (8 valence electrons)
Covalent
A chemical bond that occurs when atoms share electrons is what type of bond?
Compounds
Always made of the same elements in the same proportion?
Positive ion
An ion made of two or more atoms are covalently bonded in that act like a single ion? (usually read in parentheses)
Polar covalent bond
An unequal sharing of electrons
Polar covalent bond
An unequal sharing of electrons. an example would be water
Nonmetal
Anion Negative charge
Polyatomic ions
Are groups of atoms held together by covalent bonds?
Valence electrons
Atoms bond when their what interact?
Fill, energy
Atoms want to have blank outermost blank levels?(then they will have a structure similar to that of noble gas)
Oxidation number
Blank number tells you how many electrons in an atom has gained lost or shared to become stable.
Nonpolar covalent bonds
Formed when electrons are shared equally
Ionic bonding
Have high melting points and can conduct electricity
Properties of ionic substances
High melting and boiling points, conductivity in molten or dissolved state crystalline, soluble in water
With a super script
How do you show the oxidation number of an atom?
Octet rule
How many electrons are needed in the outer energy levels of most atoms for the atom to be chemically stable?
-ite
If the name ends with a blank indicates that ion with one less oxygen
-ate
If the name ends with the blank it indicates the ion with one more oxygen atom
Metals and nonmetals
Ionic compounds are formed between what types of elements?
Hydrate
Is a compound that has water chemically attach to its chemical formula?
Polyatomic ion
Is it covalently bonded group of atoms that has a positive or negative charge that acts as a unit.
Sodium chloride
NaCl
Covalent bonds
Often formed between two nonmetals , usually have low melting points, do not conduct electricity well
Chemical formula
Shows the types and numbers of atoms or ions making up the simplest unit of the compound
Bond
The arrangement of bonded atoms or ions within a substance? helps (determine properties)
Chemical bonds
The attractive force that holds atoms or ions together?
Oxidation number
The blank tells you how many electrons in atoms gain lose or share to become stable?
Binary compounds
The compound composed of two elements?
Chemical formula
The elements that make up a compound and the exact number of atoms of each element in a unit of the compound can be shown in a blank?
Positive, negative
The metal attains a Blank charge and the non metal attains a blank charge?
Ionic bonding
The opposite charges cause a very strong force of attraction called?
Triple bond
The strongest type of bond is a blank bond?
T
Triple bond and double bonds are awesome shorter stronger the single bond. T or F?
0
What does the sum of the oxidation numbers in a neutral compound always equal?
Polyatomic ion
What is a group of covalently bonded atom acts together as one charged atom called?
Sodium sulfate
What is the correct name of Na2so4?
Lithium fluoride
What is the name of the compound with the formula LiF?
Na2s, 2 sodium atoms to one sulfur because of their changes
What is the number of sodium atoms compared to sulfur atoms in a binary compound made from these two elements?
Ionic bond
What kind of chemical bond is formed when an Equal Exchange of electrons occur?
Left of the stair step line
Where are metals located on the periodic table?
Group 18 they are noble gases ( full outer shell octet rule)
Which group on the periodic table is the least likely to combine with other elements to form compounds?
Sodium has a positive charge in chlorine has a negative charge
Why do atoms of sodium and chlorine attract each other in a salt crystal?
Metal
anion positive charged
