Woodruff- Periodic Table

Question Answer
symbol shorthand way to write the names of elements
Rules for writing symbols Uppercase-first letter, second letter lowercase, must be printed
Where do symbols come from? Some are the Latin, Greek or German names of the elements
periodic table a table of elements arranged in order of increasing atomic number
periodic means repeats at regular intervals
Who was Dmitri Mendeleev? Russian chemist who organized 63 known elements
How are elements arranged in periodic table? increasing atomic number
atomic number indicates the number of ____ protons
Modern periodic law the chemical properties repeat in a way that allows them to be arranged in columns and rows
What are groups or families of elements? vertical column with similar chemical properties
How are the groups or families named? After the first element in group
What is the name for group V A? Nitrogen
What is the name for group VI A? Oxygen
What is the special name for group VII A? halogens
What is the name for group O? noble or inert gases
Elements in a group all have ____ the same number of electrons in the outer energy level
What are periods or series of elements? horizontal rows
What do all elements in a period have in common? the same number of energy levels
Location of an element in the table generally indicates the _____ of element it is type
Four groups into which elements can be classified depending on the number of electrons in the outermost shell metals, non-metals, metalloids, noble gases
Where are metals located on the periodic table? left side of the staircase
How many electrons do metals have in the outermost energy level? 1, 2, 3
What do metals tend to do with electrons? Lose them to non-metals
Ion charged particle
valence outer energy level of electrons
When metals lose their electrons, what type of charge do their ions have? +1, +2, +3
Where are the most active metals found? lower left corner
Why are the metals in the lower left corner most active? They are furthest from the nucleus,least attracted by their own nucleus, and easily pulled away by another
Name the most active metal Francium (Fr)
Metals are good conductors of which two forms of energy? heat and electricity
Where are non-metals located in the periodic table? to the right of the staircase
How many electrons do nonmetals have in the outermost energy level? 4, 5, 6, or 7
How many electrons do nonmetals tend to gain? 1, 2, 3
From what type of elements do they gain the electrons? metals
When nonmetals gain electrons, what type of charges do their ions have? -1, -2, -3
Where are the most active nonmetals found? upper right corner (excluding noble gases)
Why are the upper right corner nonmetals the most active? the outer electrons are nearest to the nucleus thus additional electrons are attracted by their nucleus most easily
Name the most active nonmetal. Fluorine (F)
Are nonmetals good conductors of heat and electricity? no
metalloid elements with some properties of both metals and nonmetals
Where are metalloids found? along the staircase
Name the seven metalloids B, Si, Ge, As, Sb, Te, Po
Metalloids are conductors, insulator or semi-conductors. Semi-conductors
What is a semi-conductor? a substance that conducts electricity better than an insulator, but not as well as a conductor
What are noble gases? Atoms with a full outer energy level which seldom enters into chemical reactions
Where are the noble gases located on periodic table? group O or VIIIA- column furthest to the right
How many electrons do noble gases have in their outermost energy level? 8 except He with 2
Noble gases (do or do not) have electrical balance? do- equal number of protons and electrons
Noble gases (do, do not) have a need to react do not
2/3 of elements on periodic table are classified as ____. metals
Electron configuration number of electrons in each energy level