An atom of potassium-37 and an atom of potassium-42 differ in their total number of

(1) electrons (3) protons

(2) neutrons (4) positrons

What is the weighted average atomic mass of an element?

How do liquids and gas transfer heat?

Uranium-232 has a half-life of 68.9 years. A sample from 206.7 years ago contains 1.40 g of uranium-232. How much uranium was originally present?

What mass of lif is contained in 18.66 g of a 20.0% by mass solution of lif in water?

An atom in an excited state contains more of what type of energy than the same atom in the ground state? An atom in an excited state contains more of what type of energy than the same atom in the ground state?

Zinc phosphide, Zn3P2, is often used as a rat poison. Phosphorus has 5 valence electrons. How many valence electrons does each zinc atom lose?

Nonrenewable resources are?

Watch the animation, then check off the samples that will conduct electricity. Check all that apply. View Available Hint (s) Check all that apply. NaCl solution Solid NaCl Solid sugar Sugar solution

Burning wood represents a chemical change. True or False?

Why are phosphates in laundry detergent