The mass number is

A. use the atomic number

B. mass number - atomic number

C. number of protons and neutrons in an atom

When the soot particles collide, how are they moving?

How many moles of Ca are in 425 g of Ca

Think about the lab procedure you just read. Label each factor below with V for "variable" or C for "constant".

Sub atomic particle mass

a student poured water in to a paper cup and let it freeze, when she came to take it out she saw the side pushed out

What is the scientific equesion to make antimatter?

How many molecules of molecular oxygen react with four molecules of NH3 to form four molecules of nitrogen monoxide and six molecules of water?

How many unchanged atoms would remain after 3 half-lives if the initial sample had 600 atoms? Explain.

Chegg Identify the type of reaction [ (combination (c), decomposition (d), combustion (co), single replacement (sr), double replacement (dr), or neutralization (n) ] and write a balanced equation. If there is no reaction, write NR.

A sample of a radioactive isotope initially contains 20 x 10^10 atoms. After 16 days, 5 x 10^10 atoms remain. what is the half-life of the isotope? A) 12 days B) 20 days C) 10 days D) 16 days E) 8 days