Elements and Reactions

Clues in this puzzle

Across

• Inert noble gas glowing reddish-orange in high-voltage signs (4)
• Pure substance composed entirely of atoms with identical proton counts (7)
• Malleable post-transition metal designated by Sn (3)
• Substance that accelerates a reaction without being consumed (8)
• Binary compound containing oxygen bound to another element (5)
• Attractive forces that hold atoms together within molecules (5)
• Dense, toxic heavy metal bearing the symbol Pb (4)

Down

• Shift from a rigid solid into a fluid state by absorbing heat (4)
• Rapid exothermic chemical reaction between fuel and an oxidant (10)
• Ubiquitous compound composed of two hydrogens and one oxygen (5)
• Chemical change characterized by the loss of electrons (9)
• Outermost electrons responsible for dictating chemical reactivity (7)
• Undergo a rapid phase transition from liquid into vapor (4)
• Flaky reddish product of iron reacting with oxygen and water (4)

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