Atoms that have the same number of valence electrons in their outer shell

Uranium-238 undergoes alpha decay. Therefore, uranium-238 will a. remain stable. b. change into a different element altogether. c. emit neutral particles and no energy. d. none of the above

Primary seismic waves are slow-moving and are examples of transverse waves. True False

When a substance reacts chemically to create a new substance, will that new substance have the same physical and chemical properties as the initial substance? Explain your answer in detail.

Interpret the following equation for a chemical reaction using the coefficients given: H2 (g) + Cl2 (g) 2 HCl (g) On the particulate level: of H2 (g) reacts with of Cl2 (g) to form of HCl (g).

A tank contains 50 kg of salt and 1000 L of water. Pure water enters a tank at the rate 6 L/min. The solution is mixed and drains from the tank at the rate 3 L/min. (a) What is the amount of salt in the tank initially

What distance will a truck travel in 3 hours at an average speed of 50 miles per hour?

A 5.00L balloon filled with 1.00 moles of O2 gas contains a total of how many liters?

How many nonmetals are on the periodic table?

The modern-day quantum model of the atom is better than John Dalton's model because it

A certain amount of chlorine gas was placed inside a cylinder with a movable piston at one end. The initial volume was 3.00 L and the initial pressure of chlorine was 1.60 atm. The piston was pushed down to change the volume to 1.00 L.