Chemistry Videos Search Your Question Skip to Videos All Videos AP Chem Subatomic Particles Chemical Reactions Aqueous Solutions Covalent Bonds Gases Thermochemistry Thermodynamics Find the atomic mass of Ag given the two isotopes A penny has a mass of 2.50 g and the Moon has a mass of 7.35×1022 kg Determine the number of protons, neutrons, and electrons in the following: 25 X 12 What does "X" represent in the following symbol? 80 X 35 Determine the number of protons, neutrons, and electrons in the following: 40 X 18 What does "X" represent in the following symbol? 28 X 14 How many protons (p) and neutrons (n) are in an atom of calcium-46? How many electrons are in the ion, P3-? How many protons (p), neutrons (n), and electrons (e) are in a neutral atom of iodine-125? Which of the species below has 28 protons and 26 electrons? How many electrons are in the ion, CO32-? What type of bonding is found in the compound PCl5? What is the identity of element Q if the ion Q2+ contains 10 electrons? How many electrons are in the ion, Zn2+? How many moles and how many atoms of zinc are in a sample weighing 34.9 g? A student weighs out 14.9 mg of vanadium. How many moles are in the sample? What is the mass of one atom of the element hydrogen? Magnesium has three naturally occurring isotopes. One has an isotopic abundance of 78.99% and a mass of 23.985042 amu, and the second one has an isotopic abundance of 10.00% and a mass of 24.985837 One isotope has an abundance of 57.3% and an isotopic mass of 120.904 amu. Based on these data, what is the mass of the other isotope? One has an abundance of 37.4% and an isotopic mass of 184.953 amu, and the other has an abundance of 62.6% and a mass of 186.956 amu. What is the atomic weight of the element? How many electrons are in a neutral atom of iodine-131? What is the chemical symbol for an atom that has 29 protons and 36 neutrons? Boron-9 can be represented as A sample of pure calcium fluoride with a mass of 15.0 g contains 7.70 g of calcium. How much calcium is contained in 45.0 g of calcium fluroride?
