chapter 5 organizing the elements
DESCRIPTION
CHAPTER 5 ORGANIZING THE ELEMENTS. Lavoiser (la vwah zee ay). French chemist Grouped known elements into 4 categories: -metals, nonmetals, gases and earths. Mendeleev. Mendeleev’s Periodic Table. Mendeleev ( Men duh LAY uff) 1860’s Modeled on solitaire - PowerPoint PPT PresentationTRANSCRIPT
CHAPTER 5ORGANIZING THE
ELEMENTS
Lavoiser (la vwah zee ay)
• French chemist
• Grouped known elements into 4 categories:
-metals, nonmetals, gases and earths.
Mendeleev
Mendeleev’s PeriodicTable
• Mendeleev ( Men duh LAY uff)• 1860’s• Modeled on solitaire• If elements lined up in order of
increasing mass, a pattern emerged.
• Elements with similar properties in same column
Periodic
• occurring or appearing at regular intervals or in regular cycles.
newspapers, magazines, calendars
Periodic Table• An arrangement of elements in columns, based on a set of properties that repeat from row to row.
• Mendeleev left spaces for undiscovered elements.
• The accuracy of his predictions showed how useful his table could be.
Modern Periodic Table
• Elements arranged by increasing atomic number ( # of protons) instead of mass.
- The horizontal rows are called periods, and are labeled from 1-7.
- The vertical columns are called groups, and are labeled from 1-18.
Groups (Columns)…Here’s Where the Periodic Table Gets Useful!
• Elements in the same group have similar chemical an physical properties!!
Why??
• They have the same number of valence electrons.
-highest occupied energy level of an atom.
Mendeleev’s PeriodicTable
• Mendeleev ( Men duh LAY uff)• 1860’s• Modeled on solitaire• If elements lined up in order of
increasing mass, a pattern emerged.
• Elements with similar properties in same column
Periodic
Periodic Table
• Mendeleev left ______ for undiscovered _______.
• The __________ of his predictions showed how useful his table could be.
Modern Periodic Table
• Elements arranged by ____________________ ( # of protons) instead of mass.
- The horizontal rows are called ________, and are labeled from 1-7.
- The vertical columns are called _______, and are labeled from 1-18.
Groups (Columns)…Here’s Where the Periodic Table Gets Useful!
• Elements in the same _____ have similar _______ and _________ properties!!
Why??
• They have the same number of _______________.
-highest occupied energy level of an atom.