What do you call the following element

Sulfur dioxide

Explanation

To name an element with two elements, you follow the following steps:

1. Identify the elements in the molecule from its formula.  You can review some element names and symbols from this quiz
2. Begin the name with the element name of the first element.  If there is more than one atom of this element in the molecular formula, use a numerical prefix to indicate the number of atoms.  You can take this quiz to learn more.
3. Name the second element by using three pieces:
   1. a numerical prefix indicating the number of atoms of the second element, plus
   2. the stem of the element name (e.g., ox for oxygen, chlor for chlorine, etc.), plus
   3. the suffix -ide.
   4. Combine the two words, leaving the space between them.