yes selenium is brittle, it it is struck it will usually crumble.
Selenium is the only brittle element among the four listed: The others are all metals, with the usual ductility of metals, but selenium is only a metalloid at most.
Selenium is the most brittle of the elements listed: The others are all full metals, but selenium is only a semi-metal or a metalloid, and ductility, the negative of brittleness, is a property primarily of metals.
Most likely you're thinking of sulfur (S, #16)or perhaps selenium(#34). Tellurium(#52) is brittle. a metalloid, but has a lustre.
Jons Jacob was the man to discover Selenium.
I don't know what is if or if it has one, this site is worthless, get off of it. It won't help you.
This compound is called selenium hexafluoride.
Selenium, atomic number 34.
Yes. selenium is a non metal
No, selenium is a element
Selenium is a metalloid.
No, selenium is solid.
No. Selenium is not explosive.