If the atomic number of an element is 7 and its mass number is 18, how many neutrons are in the atom's nucleus?

The molecules if DNA produced in replication are

How many moles are present in 150g of ammonium hydrogen phosphite

Which element is the most reactive? A. sodium B. nickel C. carbon D. oxygen

If 1.20 moles of an ideal gas occupy a volume of 18.2 L at a pressure of 1.80 atm, what is the temperature of the gas, in degrees Celsius? -125°C 59.5°C 273°C 32°C

In a xenon atom, which atomic shell would experience the largest effective nuclear charge?

Calculate the volume of a 0.323-mol sample of a gas at 265 K and 0.900 atm.

What is the molar mass of the following substance : Cs2CO3

What does the velocity of a wave describe

Sulfur (S) has 16 protons and 16 neutrons. How many electron shells does an element of sulfur have?

Which one of the following statements about orbital energies is incorrect? A) The energy of a given orbital increases as the nuclear charge Z increases. B) In many-electron atoms the energy of an orbital depends on both n and l.