What is the mass number most similar to?

the average mass of all isotopes of the element

the sum of the atomic numbers of all isotopes

the sum of the masses of all the isotopes

the average charge of all ions of the element

To save time, you can approximate the initial mass of the solid to the nearest ±1 g. for example, if you are asked to add 14.3 g of copper, add between 13 g and 15 g. which of the following sets include two samples with an equal density? which all that apply below 15.4 g gold and 18.7 g silver 15.2 g copper and 50.0 g copper 20.2 g silver and 20.2 g copper 11.2 g gold and 14.9 g gold

Which piece of equipment would me most useful for measuring the volume of some water? a. pan balance b. graduated cylinder c. tweezers d. flask quick

Asample of aluminum foil contains 8.60 × 1023 atoms. what is the mass of the foil?