Mots Croisés Periodic Table Essentials CrosswordVersion en ligne Key elements and terms for the periodic table. par KARYLLE CHAVEZ 1 Most abundant element in the universe; light gas. 2 Second most abundant element in the universe; inert gas. 3 Light alkali metal used in batteries. 4 Found in all organic life; basis of organic materials. 5 Atmospheric gas making up ~78% of air. 6 Essential for most aerobic respiration; highly reactive gas. 7 Noble gas used in bright signs. 8 Inert noble gas used in shielding and lighting. 8 3 4 2 7 1 Very reactive Group 1 elements like sodium and potassium. 2 Elements with properties of both metals and nonmetals. 3 Size of an atom from nucleus to outer electrons. 4 Energy required to remove an electron. 5 Element with the highest tendency to attract electrons in bonds. 6 Unreactive elements with full valence shells. 7 Tendency of atoms to attract bonding electrons. 8 Only metal liquid at room temperature. 1 5 8 4 3 2
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