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Which of the following is the BEST (most testable) hypothesis?

If the atomic number of sodium is 11, and the atomic mass of sodium is 22.990, how many protons, neutrons, and electrons does sodium have?

Which parts of the amino acids are joined together to form a protein?

Using the image of the microscope or your knowledge of a microscope, what is name of the lenses that can be rotated into position on the microscope to change the amount of magnification (this is part J in the image):

If you get lost on your slide while using the microscope, what is the best way to get the object back into focus?

Suppose an atom has 14 protons and 16 electrons, is this atom a cation or an anion?

Which of the following is true about endotherms?

Where in an atom are the electrons located?

If the atomic number of fluorine is 9, and the atomic mass of fluorine is 18.998, how many protons, neutrons, and electrons does fluorine have?

Which of the following elements is NOT an abundant element in the human body?