How can you tell if the content on a website is modified regularly?

8) Rubidium [Kr]5s has an atomic radius of 248pm. Tin, another period 5 element, has an atomic radius of 140pm. What would the correct atomic radius for xenon be? Xenon is also in Period 5 and a noble gas.

How does the specific heat of water compare to the specific heat of concrete?

A 130.0-mL sample of a solution that is 3.0*10-3M in AgNO3 is mixed with a 225.0-mL sample of a solution that is 0.14M in NaCN. After the solution reaches equilibrium, what concentration of Ag + (aq) remains?,

Two elements next to each other that have decreasing atomic masses

The coefficients in a chemical equation? A; show the valence electrons for each atom B; are the molar masses of the substances C; show the number of grams of each substance that react D; indicate the number of moles of each substance that react

In calcium fluoride, what is the closets noble gas that each ion becomes?

Americium-241 is used in some smoke detectors. it is an alpha emitter with a half-life of 432 years. how long will it take in years for 45.0 % of an am-241 sample to decay?

What is the purpose of forming a scientific hypothesis? It starts a plan to test your idea It provides the answer to your investigation It allows you to prove your idea is correct

N2 + 3h2 2nh3 how many moles of hydrogen are needed to completely react with two moles of nitrogen?

While in Europe, if you drive 119 km per day, how much money would you spend on gas in one week if gas costs 1.10 euros per liter and your car's gas mileage is 30.0 mi/gal? Assume that 1euro=1.26dollars.