Refer to a periodic table and predict which of the following elements is a gas at 25 °C and one atmosphere pressure.

Question

Quizplus · Accepted Answer

Rn (radon) is a noble gas and is the only element among the given options that is a gas at room temperature (25°C) and at one atmosphere pressure. Ra (radium), Re (rhenium), Rh (rhodium), and Ru (ruthenium) are all solids at room temperature and one atmosphere pressure.

Refer to a Periodic Table and Predict Which of the Following