Which of the following could have the electron configuration 2.8?
i. sodium (na) atom
ii. lithium (li) ion
iii. oxygen (o) ion
iv. neon (ne) atom
v. sulfur (s) ion

Bose-einstein condensation occurs at what temperature?

Adrop of acetone (nail polish remover) has a mass of 35 mg and a density of 0.788 g/cm3. what is its volume in cubic centimeters?

Which sentence about particles in matter is true? a. atoms are present in solids and liquids but not in gases. b. the particles of matter are in constant motion. c. the same kinds of atoms are found in different elements. d. when a solid changes to a liquid, the sizes of the particles change.