Radium-223 is a radioactive isotope with a half-life of 11.4 days. how long (in days) will it be before 87.5% of the sample has decayed?

Which Domains would you find single cell organisms

How can you cause a physical change

Select all of the following that are particles of atoms. protons neutrons electrons quarks Atoms are composed of particles called protons, electrons and neutrons.

Which subatomic particle is electrically neutral and found in the nucleus of an atom? A. proton B. neutron C. electron D. orbital E. nucleus

Copper is made of two isotopes. Copper-63 is 69.17% abundant and it has a mass of 62.9296 amu. Copper-65 is 30.83% abundant and it has a mass of 64.9278 amu. What is the weighted average mass of these two isotopes? Show your work.

How does phosphorus enter the human body?

When a reaction occurs between atoms with ground state electron configuration 1s2 2s1 and 1s2 2s2 2p5 the predominant type of bond formed is

How does heat transfer takes place between any two systems?

Hydrate name of CaCl2 * 8 H2O

Calculate the heat evolved from a mixture of 14.1 l of sulfure dioxide