All of these are 1 point problems. If you’re good at chemistry could you please help me?

Write the symbol for every chemical element that has atomic number greater than 3 and atomic mass less than 12.0 u.

Adilute aqueous potassium nitrate solution is

Jose and eric were given four samples in lab. the results of their analysis are shown in the table. based on the data they collected, which sample is most likely a metal?