Captain Kirk has set a trap for the Klingons who are threatening an innocent planet. He has sent small groups of fighter rockets to sites that are invisible to Klingon radar and put a decoy in the open. He calls this the "fishhook" strategy. Mr. Spock has sent a coded message to the chemists on the fighters to tell the ships what to do next. The outline of the message is
Fill in the blanks of the message using the following clues.
(1) Symbol of the halogen whose hydride has the second highest boiling point in the series of HX compounds that are hydrogen halides.
(2) Symbol of the halogen that is the only hydrogen halide, HX, that is a weak acid in aqueous solution.
(3) Symbol of the element whose existence on the sun was known before its existence on the earth was discovered.
(4) The Group 5A (15) element in Table 19-13 that should have the most metallic character.
(5) Symbol of the Group 6A (16) element that, like selenium, is a semiconductor.
(6) Symbol for the element known in rhombic and monoclinic forms.
(7) Symbol for the element that exists as diatomic molecules in a yellow-green gas when not combined with another element.
(8) Symbol for the most abundant element in and near the earth’s crust.
(9) Symbol for the element that seems to give some protection against cancer when a diet rich in this element is consumed.
(10) Symbol for the smallest noble gas that forms compounds with fluorine having the general formula AF2, and AF4 (reverse the symbol and split the letters as shown).
(11) Symbol for the toxic element that, like phosphorus and antimony, forms tetrameric molecules when uncombined with other elements (split the letters of the symbol as shown).
(12) Symbol for the element that occurs as an inert component of air but is a very prominent part of fertilizers and explosives.
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