How do you find concentration from absorbance mg and ml?

I find that there are 500 atoms of U-235 and 1500 atoms of Pb-207. If we assume the mineral contained only parent and no daughter, then how many atoms of these elements were in the mineral when the rock first formed?

What volume is occupied by 19.6 g of methane at 27°C and 1.59atm?

What function does the central vacuole in a plant cell performs

How did john dalton contribute to the atomic theory?

What type of bond is formed when two nonmetal atoms get close enough for their orbitals to overlap? a - ionic bond b - covalent bond c - metallic bond

What is the name of the hybrid orbitals used by chlorine in clf3?

Which one is correct A. It allowed them to escape B. It allowed them to chase down C. It allowed them to reach food D. All of these

Boron is one position to the left of carbon on the periodic table. the atomic number of carbon is 6. given its position on the periodic table, what is the atomic number of boron

Actions of the non-valence electrons, diluting the force of the attraction between nucleus and valence electrons is called

Which statements accurately describe the greenhouse effect? Check all that apply. It is caused by liquids on Earth's surface. It is caused by gases in Earth's atmosphere. It warms up Earth's surface and the lower atmosphere.