select the correct answer.\nwhich of these elements is a metal?\na. hafnium (hf)\nb. radon (rn)\nc. silicon…
select the correct answer.\nwhich of these elements is a metal?\na. hafnium (hf)\nb. radon (rn)\nc. silicon (si)\nd. sulfur (s)\ne. selenium (se)
Answer
Brief Explanations:
To determine which element is a metal, we analyze each option:
- Option A (Hafnium, Hf): Hafnium is a transition metal, exhibiting metallic properties (e.g., luster, conductivity).
- Option B (Radon, Rn): Radon is a noble gas (non - metal).
- Option C (Silicon, Si): Silicon is a metalloid (has properties of both metals and non - metals, not a pure metal).
- Option D (Sulfur, S): Sulfur is a non - metal (typical non - metallic properties like brittleness, poor conductivity).
- Option E (Selenium, Se): Selenium is a non - metal (or metalloid in some contexts, but not a metal).
Only hafnium (Hf) is a metal.
Answer:
A. hafnium (Hf)