KBC 2023| Which of these elements is not a metal? KBC 2023, Check the answer to the question- Which of these elements is not a metal? By Himani Budakoti - October 20, 2023 KBC 2023, The options of the question – Which of these elements is not a metal? A. Hydrogen B. Sodium C. Lithium D. Cobalt The answer is A. Hydrogen.