What is the atomic number of an element?

a. The number of valence electrons

c. The number of electrons in the inner most shell

b. The number of protons in the nucleus

d. The total number of electrons

The name for NH3 is: Mononitrogen trihydride Mononitrogen trihydroxide Nitrogen trihydride Nitrogen trihydroxide

At standard pressure, during which physical change does the potential energy decrease?

Find the number of moles of water that can be formed if you have 138 mol of hydrogen gas and 64 mol of oxygen gas.

Why does split petrol form a stick on top of water?

What is the mole fraction of ethanol in a solution made by dissolving 29.2 g of ethanol, C2H5OH, in 53.6 g of water?

An experimental procedure says to accurately weigh approximately 1 g of substance on analytical balance. Which of the following measurements are consistent with these instructions? Select all that apply. 1.0456 g 1.0 g 0.9811g 1 g 1.01g O 0.99

What type of mixture is 100 ml of water with a little bit of salt?

Which statement explains why meiosis haploid cells rather than diploid cells

Which factors can affect the amount of coco mix that can be dissolved in water? Check all that apply

If 25% of a radioactive element remains after 1,000 years, what is the half-life?