what-is-one-challenge-in-determining-the-state-of-matter-for-synthetically-made-

Question

What is one challenge in determining the state of matter for synthetically made elements in the seventh row of the periodic table?

Accepted Answer

Their instability makes it difficult to observe them for long periods.

Answer

They are all gases at room temperature.

Answer

They are all liquids at room temperature.

Answer

They have fixed shapes and volumes.