Which characteristic of an atom always varies among atoms of different elements

Round this number to two significant figures. 5,206

Which of the following combinations of quantum numbers (n, l, ml, ms) do not represent permissible solutions of the schrodinger equation for the electron in the hydrogen atom?

Predict how the addition of hydrogen gas would affect the initial rate of the reaction below, and explain your prediction.

A glass flask containing 100 milliliters of water is sealed with a rubber stopper and placed on a burner. After a while, gas condenses on the inside surface of the flask near the stopper.

Will every solid with the same dimensions have the same density?

What jobs involve chesmistry

Think about a neutral magnesium atom. Then think of a magnesium ion with a 2+charge. How are these two alike? How are they different? Be sure to use the terms proton, neutron, and electron in your answer.

What subatomic particle is specifically responsible for combining the atoms together to form a new substance?

A chemist reported that 100 gallons of a gas were available in a laboratory. Which property of the gas did the chemist report?

Is the water density higher than the aluminum density