Organizing Elements
Elements and the Periodic Table
Elements and the Periodic Table Cont'd
What the Periodic Table Can tell Us...
Periodicity
100
Chemists use these to sort elements into groups...
What are properties?
100
This class of elements represents about 80% of the periodic table...
What are metals?
100
These royal nonmetals don't typically form bonds and are part of Group 8A.
What are the Noble gases?
100
The two letters in the square for each element on the periodic table, are known as this...
What is the chemical or element symbol?
100
Atomic size follows this trend on the periodic table (discuss the trend from left to right and top to bottom)...
What is it decreases from left to right and increases from top to bottom?
200
Repeating properties were used in order to organize elements in this chemical chart..
What is the periodic table?
200
These types of elements can have properties of either metals and non-metals based on external conditions..
What are metalloids?
200
Fluorine belongs to a group that goes by this name and is located in column 7 of the periodic table...
What is the halogens?
200
The atomic number tells us the number of protons as well as the number of these in a neutral atom...
What is electrons?
200
The effective nuclear charge felt by electrons in the higher energy levels of an atom of an element will be less thatn the charge within the nucleus because of this effect...
What is shielding?
300
This German Chemist organized the elements according to atomic mass...
Who is Mendeleev?
300
Chlorine is an example of an element that would belong to this class...
What is a nonmetal?
300
The elements in Groups 1A-7A are known as these...
What are representative elements?
300
The electrons in the outer most energy level of an atom are known as these...
What are valence electrons?
300
When an atom of an element gains an electron, this is formed...
What is an anion?
400
In the modern periodic table, elements are organized based on this property...
What is atomic number?
400
Group 1A elements are known as these...
What are alkali metals?
400
The two types of elements included in Group B are known as....
What are transition and inner transition metals?
400
When looking a the periodic table, this will tell you the number of valence electrons in a particular atom of an element...
What is the group number?
400
The ability of an atom of an element to gain an electron is known as this...describe its trend as you move from left to right and top to bottom across the periodic table.
What is electronegavity? Decreases from top to bottom and increases from left to right.
500
Properties of all elements within a given ________ will be similar, however, within a period this is not the case. Fill in the blank and explain what can be said about properties of elements in the same period
'group' The properties of elements within a period change as you move across a period from left to right; however, the pattern of properties within a period repeats as you move from one period to the next (periodic law- when elements are arranged according to their atomic number, there is a periodic repetition of their chemical and physical properties)
500
Alkaline earth metals belong to this group...
What is group 2A
500
Noble gases have this many electrons in their outer most energy level...
What is 8?
500
Explain which classes of elements form cations and which form anions and describe how the size of cations and anions compares with the size of the element from which it was formed.
Metals will form cations; nonmetals form anions; Cations will be smaller as they are losing electrons and anions will be bigger b/c they are gaining electrons.
500
Explain why as effective nuclear charge increases ionization energy increases and atomic size decreases.
As nuclear charge increases the attraction force between the nucleus and the electrons increases making it harder for an electron to be removed. In addition as nuclear charge gets greater the nucleus pulls the electrons in closer so the atom is smaller.
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