How many atoms are in each of the following?

a) 1.0g of hydrogen atoms, each of mass 1.0u

b) 12.0g of carbon atoms, each of mass 12.0u

c) 23.0g of sodium atoms, each of mass 23.0u

As the elements in Group 17 on the Periodic Table are considered from top to bottom, what happens to the atomic radius and the metallic character of each successive element? (1) The atomic radius and the metallic character both increase.

Which of the following gases moves the fastest? A. Neon B. Argon C. Oxygen D. Helium

Why are waves an important feature of the ocean surface

Which of these factors is least likely to determine whether a given solute dissolves in a given solvent? A. whether the solvent and solute are both polar B. whether the solvent and solute are both nonpolar C.

The experiment that shot heavy particles at a thin sheet of gold foil was responsible for leading to the discovery of the what?

Determine the molecular formula for the unknown if the molecular mass is 60.0 amu and the empirical formula is ch2o.

Draw the organic product of the following nucleophilic reaction

How does the energy of the activated complex compare with the energies of reactants and products? select one: a. it is lower than the energy of both reactants and products. b.

A student asked to convert measurements from liters to mililiters and from mililiters to liters. His answers are shown in bold in the choices shown below. On which choice did he make a mistake?

Donald is making a model of a nitrogen atom. The box for nitrogen in the periodic table is shown. To represent a neutral atom, which of these must Donald include in his model?