Question

At STP or standard conditions, which list of elements contains a solid, a liquid, and a gas?
A. Hafnium, Mercury, and Helium
B. Barium, Bromine, and Boron
C. Chromium, Chlorine, and Carbon
D. Selenium, Tin, and Strontium

Answer 1

Answer:

B.hafnium, mercury,helium

Explanation:

because the atomic number of hafnium is 72is a solid, mercury is a gas the atomic number is 80,

helium is a gas the atomic number is 2