Flame Test of Ions Lab Experiment - Li, Na, K, Sr, and Cu Ions

Flame Test of Ions, including Li, Na, K, Sr, Cu, and an unknown. What do you think the unknown is?
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In this video, James of Bond with James, tests various metal salts via different flame tests. He created this video for students to view if they were absent and/or wanted to review what they had completed during the flame test of ions lab.
James completes the flame test of ions for the following metallic salts: Li, Na, K, Sr, and Cu. He also tests a flame test unknown sample. Hopefully, you paid attention. Do you know which metallic ion (or ions) it is?
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