Simplify the following text for a Grade 8 native English-speaking person.
Original: Other selenium halides include , , , and . Selenium dichloride , an important reagent in the study of selenium chemistry , may be prepared in pure form by reacting elemental selenium with ( ( sulfuryl chloride ) ) in THF solution .
Simplified: The +1 state is found in some selenium compounds , such as selenium ( I ) chloride .