A certain element forms an ion with 18 electrons and a charge of 2+. Identify the element.

Suppose that you measure a pen to be 11.8 cm long. Convert this to meters.

Which of the following is equal to exactly 1 mole of atoms?

Determine the molecular formula of a compound that is 49.48% C, 5.19% H, 28.85% nitrogen, and 16.48% oxygen. The molar mass of this compound is 194.19g/mol.

Determine the empirical formula for a compound that was found to contain 10.15g of P and 34.85g of Cl.

How many protons, neutrons, and electrons are in an atom with the following notation:

Who was the architect and first artist whose name was recorded?

Determine the number of protons, neutrons, and electrons in the following: (_29^65)X

An element has 3 naturally occurring isotopes with the following masses and abundances. Calculate the atomic mass of the element: 47X: 46.9217 amu has an abundance of 38.11% 48X: 47.9501 amu has an abundance of 22.39% 49X: 49.0124 amu

How many protons does the As3+ ion possess?