Helmenstine, Anne Marie; sciences, Ph D. Dr Helmenstine holds a Ph D. in biomedical; Writer, Is a Science; educator; school, consultant She has taught science courses at the high; college; Levels, Graduate. "What You Need to Know About Metallic Character and the Periodic Table". ThoughtCo (بالإنجليزية). Archived from the original on 2019-04-15. Retrieved 2019-04-06.
Helmenstine, Anne Marie; sciences, Ph D. Dr Helmenstine holds a Ph D. in biomedical; Writer, Is a Science; educator; school, consultant She has taught science courses at the high; college; Levels, Graduate. "What Is Ionization Energy?". ThoughtCo (بالإنجليزية). Archived from the original on 2019-10-14. Retrieved 2019-11-23.
Helmenstine, Anne Marie; sciences, Ph D. Dr Helmenstine holds a Ph D. in biomedical; Writer, Is a Science; educator; school, consultant She has taught science courses at the high; college; Levels, Graduate. "What You Need to Know About Metallic Character and the Periodic Table". ThoughtCo (بالإنجليزية). Archived from the original on 2019-04-15. Retrieved 2019-04-06.
Helmenstine, Anne Marie; sciences, Ph D. Dr Helmenstine holds a Ph D. in biomedical; Writer, Is a Science; educator; school, consultant She has taught science courses at the high; college; Levels, Graduate. "What Is Ionization Energy?". ThoughtCo (بالإنجليزية). Archived from the original on 2019-10-14. Retrieved 2019-11-23.
