What does testable mean

If two identical atoms are bonded,what kind of molecule is formed

What is the empirical formula of a compound that is 50.7% antimony and 49.3% selenium ?

27 drag each label to the correct location on the image. a particular exosolar system has five planets in total: a, b, c, d, and e. the table lists the orbital periods of these planets in days. planet orbital period (days) a 600 b 80 c 1,000 d 500 e 100 move each planet to its orbit in the system.