Presentation on theme: "Periodic Table of Elements video"— Presentation transcript:
1Periodic Table of Elements video The Periodic LawPeriodic Table of Elementsvideo
2Development of the Periodic Table Dmitri Mendeleev developed the first periodic tableThe periodic table is an arrangement of elements according to their chemical and physical properties
3Mendeleev’s Periodic Table Mendeleev arranged the elements according to their atomic massesThe elements followed a pattern of (valence electrons)video
4Questions Who developed the first periodic table? What is the periodic table?What are valence electrons?How did Mendeleev arrange elements in the first periodic table?
5PeriodicRefers to repeating according to a pattern
6QuestionsWhy are the days of the week and the months of the year periodic?
7Modern Periodic Table video Henry Moseley determined the atomic number of the elementsElements in the modern periodic table are arranged according to atomic numbersvideo
8Periodic LawStates that the physical and chemical properties of elements are periodic functions of their atomic numbersProperties of elements have some pattern according to their atomic numbers
9QuestionsWhat is the major difference between Mendeleev’s periodic table and the modern periodic table?
10Columns in the periodic table Columns of elements are known as groups or familiesElements in a family have similar properties
11Rows in the periodic table The horizontal rows of elements are called periodsThe elements in a period do NOT have similar properties
12PeriodsFirst element in a period is an active solidLast element in a period is an inactive gas
13QuestionsWhat is the major difference between periods and families?How are elements in a family similar?How are elements in a period different?
14Element squares in the periodic table The basic information found in each square of the periodic table :Atomic numberChemical symbolElement nameAtomic massvideo
15ElementsElements are classified as:MetalsNonmetalsMetalloids
16QuestionsWhat information is found in the squares on the periodic table?How can an element be classified?
17Characteristics of Metals (video) Good conductors of heat and electricityShiny; High melting pointsMalleable (bends easily)Ductile (can be made into wires)Found on the LEFT of the periodic table
18QuestionsWhat is the difference between ductile and malleable?Where are metals found on the periodic table?
19Properties of Nonmetals DullBrittle (hard/ easily broken)Found on the RIGHT of the periodic tablevideo
20Properties of Metalloids Has properties of both metals and nonmetalsFound touching the dark, zig-zag lineMetalloid means “metal-like”video
21QuestionsWhat is a metalloid?Where are metalloids located in the periodic table?Where are nonmetals located on the periodic table?
22Periodic Properties of Elements (Modern Table) Valence pattern across a period is (left to right)Metals lose electrons easilyNonmetals gain electrons easily
23Periodic Properties of Elements The size of the atom decreases from left to right across a periodThe metallic properties of elements decrease from left to right across a periodElements on the left are more reactive than the elements on the right
24QuestionsWhat happens to metallic properties as one moves from left to right across a period?What is the valence pattern of electrons across a period?video