The table shown here includes data similar to those used by Mendeleev when he created the periodic table. On a small card, write the symbol, atomic mass, and a stable compound formed by each element. Without consulting a periodic table, arrange the cards so that atomic mass increases from left to right and elements with similar properties are above and below each other. Copy the periodic table you have invented onto a piece of paper. There is one element missing. Predict its mass and a stable compound it might form.

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Element Be S LL Ca Li Si CI B Ge N O Ga Atomic Mass 9 32 19 40 7 28 35.4 10.8 72.6 14 16 69.7 Stable Compound BeCl₂ H₂S F₂ CaCl₂ LICI SiH4 Cl₂ BH3 GeH4 NF3 H₂O GaH3