Unit 7 Test Flashcards
(32 cards)
Compounds are formed so atoms can be more…
Stable
Any element that has gained or lost electrons is called an…
Ion
Positively charged ions are called…
Cations
Positive Ions gain/lose electrons to gain a stable octet.
Lose
Negatively charged ions are called…
Anions
Negative ions gain/lose electrons to gain a stable octet.
Gain
The ____ _____ do not form ions because they already have 8 electrons in their outermost energy level which is very stable!
Noble Gases
Name of the group that forms a 2+ ion charge.
Alkali Metals
Characteristics of Alkali Metals.
Not found free in nature.
Extremely Reactive
Very Soft
Luster
The most reactive non-metals because they only need 1 electron to become stable.
Halogens
The ____ _____ have many elements that can form more than 1 ion.
Transition Metals
Binary compounds are composed of only __ elements and have the ending ___.
2
Ide
_____ ions are composed of two or more atoms bonded together with a single charge.
Polyatomic
The ____ electrons are those that are used to form ions.
Valence
When Ionic compounds form, the overall (net) charge is always…
zero
Ions are arranged in a structure called a…
Crystal Lattice
Characteristics of the results of ionic compounds.
High melting/boiling points
brittle
many dissolve in water
electrolytes when dissolved
form a crystal lattice
conduct electricity, only when dissolved in liquid.
Roman numerals are used when?
To identify the charge on transition metal with more than one charge.
Example of a transition metal that does not use a roman numeral in its name:
Zn, Ag, Sc
What do the subscripts of a formula show?
How many atoms of that element are in the compound.
When are parentheses used in a formula?
When a formula contains more than 1 polyatomic ion.
How many atoms make up Li3Po3?
7
How many atoms make up (NH4)2SO4
15
All binary compounds end in…
ide
