What is the electron configuration of an element with atomic number 20?

How many moles are in 4.65 x10^24 molecules of no2?

Give the symbol of the ion that contains 34 protons and 36 electrons

All of the following are changes brought about by the geological process except

If the temperature is constant what change in volume would cause the pressure of an enclosed gas to increase by a factor of 4

Ethyl alcohol has a latent heat of vaporization of 850 J/g. Water has a latent heat of vaporization of 2260 J/g. Container A contains 1.0 kg of ethyl alcohol. Container B contains 1.0 kg of water. Both liquids are brought to a boil.

Is evaporation/condensation a physical or chemical change? Explain

Would the two as yet undiscovered elements A+1 and D+2 react?

Ammonium perchlorate is a powerful solid rocket fuel, used in the Space Shuttle boosters. It decomposes into nitrogen gas, chlorine gas, oxygen gas and water vapor, releasing a great deal of energy.

Determine the number of bonding electrons and the number of nonbonding electrons in the structure of SeCl2.

The same amount of energy is required to remove each electron sequentially from an atom. A. TrueB. False