A scientist has a "mystery element" that she wants to identify by using its properties. These properties include its freezing point. She collected data about the element's freezing point (horizontal line) and displayed it on the graph below. Use the graph above to determine the freezing point of the element (horizontal line). Which of these elements is the "mystery element"? The freezing point of each element is listed by its name. Question 4 options: iron (1539°C 1539 ° C ) nickel (1455°C 1455 ° C ) cobalt (1495°C 1495 ° C ) silicon (1430°C 1430 ° C )