1) Find the old man out:
1. Strontium-10, cadmium, cerium-14, Barium140
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Answer:
strontium
Explanation:
Strontium is the chemical element with the symbol Sr and atomic number 38. An alkaline earth metal, strontium is a soft silver-white yellowish metallic element that is highly chemically reactive. The metal forms a dark oxide layer when it is exposed to air.
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