2. Atoms & Elements

Which part of the periodic table indicates the number of energy levels (principal energy shells) in the electron cloud of an atom?

Which group on the periodic table contains the only liquid nonmetal at room temperature?

Which of the following elements is usually a liquid at room temperature?

On the periodic table, where are the gaseous elements primarily located at room temperature?

Which of the following elements is a liquid at room temperature?

At 100 °C and 1 atm, water is in which phase?

Which of the following correctly describes the physical state of each halogen at room temperature (approximately 25°C)?

At a temperature of 150 °C and standard atmospheric pressure, what is the phase of water?

Which of the following elements is a liquid at room temperature (25°C)?

On the periodic table, where are the gaseous elements primarily located?

On the periodic table, where can you find information about the phases (solid, liquid, gas) of elements such as water at room temperature?

Which of the following elements is a liquid at room temperature (25°C)?

On the periodic table, where are the majority of radioactive elements located?

Which of the following elements is a liquid at room temperature (25°C)?