No. Room temperature is 20C, and Mercury is liquid at this. Gallium melts slightly higher, and will liquify in someone's hand or in hotter climates. Caesium has a melting point of 29C. So this metal...
No, they are not. Butter will not go liquid at room temperature, unless it's in a hot room. (In most moderate room temperatures it is still solid). Lard melts an an even higher temperature than...