The atomic number of an element is equal to the number of protons in each atom of the element. All helium atoms have 2 protons. What is the atomic number of helium?

What physical state of matter is associated with the strongest attractive forces between particles (molecules, ions, or atoms) ?

The equations are not balanced. Which equation would have the same coefficients in the same order as 2CO2 + 3H20 → C2H6O + 3O2? Al + FeO → Al2O3 + Fe CH4 + O2 →CO2 + H2O PCl5 + H2O → HCl + H3PO4 FeCl3 + NH4OH → Fe (OH) 3 + NH4Cl

Is polythene a conductor or an insulator (eletricity)

The following equation is one way to prepare oxygen in a lab. 2KClO3 → 2KCl + 3O2 Molar mass Info: MM O2 = 32 g/mol MM KCl = 74.55 g/mol MM KClO3 = 122.55 g/mol If 4.

What is the oh-concentration and ph in each solution? (a) 0.225 m koh, (b) 0.0015 m sr (oh) 2?

An aqueous solution is made from a molecular compound rather than from an ionic compound. If some ions are present in solution, which best describes the solute? A. a weak electrolyte B. a nonelectrolyte C. a strong electrolyte D.

Which of the following measures the radiation given off by atoms per second?

What is the name of the outermost layer that forms a boundary around the outside of each cell

What does an ionic compound form?

How many electrons in an atom could have these sets of quantum numbers n=7 l=3 ml=-1?