It is the second-most electropositive element, behind only caesium, and is the second rarest naturally occurring element (after astatine). The isotopes of francium decay quickly into astatine, radium, and radon. The electronic structure of a francium atom is [Rn] 7s1, and so the element is...
When you go into a room and touch a piece of metal in that room, it feels colder than a piece of plastic. Explain. Consider two metals: Metal A and Metal B (Metal A = 0.130 J/g degrees C; Metal B = 0.449 J/g degrees C) If a student has the same mass of both...
According to one aspect of the invention M is an alkali metal ion such as lithium, sodium, potassium, or caesium, particularly lithium, sodium or potassium, although metallic elements in the second row of the Periodic Table such as barium, magnesium or calcium may be useable, as may transitio...
Morphine has the formula C17H19NO3. It is a base and accepts one proton per molecule. It is isolated from opium. A 0.682-g sample of opium is found to require 8.92 mL of a 0.0116 M solution of sulfuric acid for neutralization. Assuming that morphi...
14941/52. Class 39(1) [Also in Group XXIII] An alkali-metal, especially caesium, vapour lamp has an envelope of hard lime glass coated internally with a glass which resists attack by caesium vapour at temperatures of from 400 to 600C. The resistant glass, which is of the ternary system...
14941/52. Class 39(1) [Also in Group XXIII] An alkali-metal, especially caesium, vapour lamp has an envelope of hard lime glass coated internally with a glass which resists attack by caesium vapour at temperatures of from 400 to 600C. The resistant glass, which is of the ternary system...