150 likes | 154 Views
Periodic Table. How did Dmitri Mendeleev arrange the periodic table?. He was a Russian chemist who arranged the periodic table by the increasing in atomic mass. Henry Moseley. British scientist Determined the number of protons (atomic number) in an atom
E N D
How did Dmitri Mendeleev arrange the periodic table? • He was a Russian chemist who arranged the periodic table by the increasing in atomic mass.
Henry Moseley • British scientist • Determined the number of protons (atomic number) in an atom • He arranged elements in the Periodic Table according to the increase in atomic number.
Metals • Found to the left of the zigzag line in the Periodic Table • Solid at room temperature, good conductors, malleable, ductile and shiny
Metalloids • Also called semiconductors. • Found at the border of the zigzag line on the Periodic Table • They have some properties of metals and nonmetals (hard, very brittle) Color the metalloids purple (#6)
Nonmetals • Found to the right of the zigzag line in the Periodic Table • Poor conductors, not malleable, not ductile and not shiny Color the nonmetals that are not noble gases blue (#7) Circle and label the halogens in green (#13)
Period • Each horizontal row of elements from left to right on the Periodic Table • As you go from left to right, atomic number increases by 1 • number of protons increases by 1 • number of electrons also increases by 1 in the same valence shell
Group • Each column of elements from top to bottom on the Periodic Table. • Also known as Family • Elements in a ‘family’ behave in a similar way • Example: Group 1 (all except Hydrogen) elements are called alkali metals. How are they similar? • They react explosively with water!
How many periods and groups are there in the periodic table? There are 7 periods and 18 groups in the periodic table
Periodic Law • The chemical and physical properties of elements are periodic functions of their atomic number.
Periodic Table worksheet • Color the square for hydrogen yellow (#1) • Using black pencil or marker, mark the zigzag line (#5) • Color the Noble Gases orange (#3) Noble gases are stable and do not take part in chemical reactions.
Clor the groups with very reactive metals red (#2) • Color the transition metals green (#4) • Color the metals in groups 13 to 16 brown (#8) • Circle and label alkali metals blue (#11) • Circle and label alkaline earth metals in purple (#12
Video • HOW ELEMENTS ARE CREATED? • Island of Stability: A nuclear chemist aims to create entirely new elements to add to the periodic table. Aired October 3, 2006 on PBS http://www.pbs.org/wgbh/nova/hysics/stability-elements.html
Quick Review • Outermost energy level of an atom is called valence shell. • Electrons in valence shell are called valence electrons. • Group number indicates the number of valence electrons. • Period number determines the number of energy levels (or rings).