The Periodic Table flashcards

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What orders the periodic table?Periodic Organization: Increasing atomic number.
What is a period?Periodic Organization: A horizontal row.
What is a group?Periodic Organization: A vertical column of elements.
What is atomic number Z?Periodic Organization: Proton count.
What orders the modern periodic table?Periodic Organization: Atomic number.
Does atomic mass directly equal proton count?Periodic Organization: No; atomic number identifies proton count.
What are valence electrons?Valence Electrons: Outer electrons most involved in bonding in an introductory model.
What common ion charge do group 1 metals form?Valence Electrons: +1 in many simple compounds.
What common ion charge do halogens form?Valence Electrons: −1 in many simple ionic compounds.
Are noble gases absolutely inert?Valence Electrons: No; some compounds can form under suitable conditions.
What does the octet model suggest?Valence Electrons: Many main-group atoms bond toward eight outer electrons.
Does the octet model have exceptions?Valence Electrons: Yes; it is a limited model.
What remains unchanged during ordinary ion formation?Valence Electrons: The proton count and nucleus.
What is atomic radius?Periodic Trends: A measure of an atom’s size under a specified definition.
What is first ionization energy?Periodic Trends: Energy to remove one electron from a gaseous neutral atom.
What is electronegativity?Periodic Trends: Tendency to attract shared electrons in a bond.
Why does radius usually increase down a group?Periodic Trends: More occupied shells and shielding.
Why must a trend prediction be qualified?Periodic Trends: Electron configurations produce exceptions.