Which element indicated by letter in the following periodic table is a gas at room temperature and a pressure of 1.0 atm? 
Definitions:
Antianxiety Medication
Drugs that are used to treat and manage anxiety symptoms by affecting the central nervous system.
Serotonin
A neurotransmitter that has a wide variety of functions in the human body, often associated with contributing to feelings of well-being and happiness.
Serotonin
A neurotransmitter in the brain that affects mood, social behavior, appetite, digestion, sleep, memory, and sexual desire.
Depression
A common psychological condition involving persistent sadness, loss of interest in activities, and may include various emotional and physical problems.
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