The US singer you are looking for is Bruno Mars. His first name, "Bruno," has five letters, and his surname, "Mars," has four letters, fitting the criteria provided.
The actor and presenter you are referring to is "Matthew Fox." He has a first name with 7 letters and a surname with 3 letters.
I don't have the full answer but some of the letters are _O_E
Edward Norton
Sylvester Stallone
· Harrison Ford
Claudia winkleman
tv presenter 4 and 4
Dick Clark
To provide an accurate answer, I would need to know your surname. However, if you share the first two letters of your surname, I can identify the corresponding element and give you its atomic mass. Please let me know!
American opera singer Clara Louise Kellogg 1842-1916.
Anne HathawayAnna Kendrick
Click link below and take your pick!