Less dense then gas

Which of the following states that two electrons can occupy the same orbital only if they have opposite spins? Hund's rule Dalton's theory Aufbau principle DeBroglie's theory Pauli exclusion principle

For fusion reaction to happen, matter needs to be in which of the following states?

A lithium atom has an atomic number of 3 and a mass of 7. The number of electrons which it has in the 1st shell (principal energy level) is?

5.00 g of an unknown compound was dissolved in 250.0 mL of water. The unknown compound was found to be a non-electrolyte and the osmotic pressure of the solution was determined to 14.5 atm at 298 K.

Playing (as opposed to working) in the laboratory or bothering another person is a). all right (if your working) b). Not dangerous c). Always against the rules d). all right

When does a spring tide take place? At the beginning of spring Only during the spring season Only after spring is over At any time

The highest cloud are known as

What is the mass of 4.85 X 10^22 atoms of iron (Fe) ?

If element x has 95 protons how many electrons does it have

Which of the following when dissolved in deionized water would make a good conducting solution? a) methanolb) sugarc) baking soda