Unit 5 - Chemistry | Flashcards

Questão	Responda
Alkali Metals	Group 1 on the periodic table.
Alkaline Earth Metals	Group 2 on the Periodic Table
Anion	A negative ion that results from gaining electrons.
Atomic Radius	Half the distance between two nuclei of the same element when bonded together. (i.e. how big an atom is.)
What did Cannizzaro do?	Determined the atomic weight of 60 elements elements and the value for Avogadro's Number.
Cation Radii	A positive ion that results from losing electrons.
Electron Affinity	Energy released when another electron is added to an atom.
Electronegativity	Pull an atom has on the shared electrons in a bond with another atom.
Halogens	Group 17 on the Periodic Table
Ion	A group of atoms that carries an electric charge.
Ionization Energy	Energy required to remove the outermost electron from an atom.
What did Mendeleev do?	Created a Periodic Table of 63 elements ordered by atomic number. He also predicted numerous elements.
Metalloids	Elements with properties intermediate between those of metals and sold nonmetals.
What did Moseley do?	He discovered that the elements should be arranged by atomic number instead of atomic mass.
Noble Gases	Group 0 on the Periodic Table.
Periodic Table	An arrangement of elements in order of increasing atomic numbers.
Periodic Law	The properties of elements are periodic functions of their atomic numbers. (i.e. properties of elements appear in periodic patterns.)
Periodicity	Predictable patterns and trends on the periodic table.
Transition Metals	Groups 3-12 on the Periodic Table; 38 elements with valence electrons in more than 1 shell.
Valance Electrons	Electrons on the outermost energy level of an atom.
Periods	Rows on the Periodic Table.
Groups	Columns on the Periodic Table.
Atomic Number	Number of protons in an atom.

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