What value is the closest to the atomic mass of cerium?

Isotope Percent Abundance

136Ce 0.185%

138Ce 0.251%

140Ce 88.450%

142Ce 11.114%

Explain how the understanding of atomic emission spectrum led to development of the atomic theory

How many neutrons does niobium have

Unstable isotopes undergo radioactive decay. what occurs during radioactive decay?

What does an - ite or - ate ending in a polyatomic ion mean? Sulfur is in the formula. Nitrogen is in the formula. Bromine is in the formula. Oxygen is in the formula.

Which of the following is an example of an irreversible physical change? A. Melting a piece of lead B. Boiling water C. Sharpening a pencil D. Dissolving sugar into water

If the mass of a material is 76 grams and the volume of the material is 16 cm3, what would the density of the material be? g/cm3

Calculate the specific heat of a metallic element if 50.0 g of the metal need 314 joules of heat energy to raise the temperature from 25°C to 50°C.

State the relationship between the number of electrons in a carbon-nitrogen bond and carbon-nitrogen bond energy

What are the characteristics of bones?

If 294 grams of FeS2 is allowed ti react with 176 grams of O2 according to the following equation how many grams of Fe2O3 are produced? FeS2 + O2 = Fe2O3 + SO2