If an atom has 14 protons, 12 neutrons, and 18 electrons, what is the atom's electrical charge?

a. - 4

b. 4

c. 6

d. - 6

The isotope lithium-7 has a mass of 7.0160 atomic mass units, and the isotope lithium-6 has a mass of 6.0151 atomic mass units. given the information that 92.58 percent of all lithium atoms found in nature are lithium-7 and 7.

16.0 g of gas occupy a volume of 8.0 L. What is the density?

Newton's first law of motion states that an object at rest stays at rest, and an object in motion stays in motion, unless acted on by an unbalanced force.

More polar solvents (eluents) move molecules more rapidly than less polar solvents. If you used a 1:1 hexanes:methanol mixture as solvent, would you expect the products to elute faster or slower?

Thursday: Atoms 1) Smallest Unit of matter:
 2) Center of atom:
 3) positive particles in center of atom:
 4) neutral particles in center of atom:
 5) negative particles surrounding the center of the atom:
 6) electrons in the outermost energy level.

Name 3 characteristics that can be used to identify minerals

Hemoglobin, the oxygen-carrying protein in red blood cells, has four iron atoms per molecules ad contains 0.340 percent iron by mass. calculate the molar mass of hemoglobin

Nancy wants to find out how the steepness of a hill's slope affects the amount of soil that erodes from it. She has soil, a long pan, and a pile of books with which to build a model hillside. She has a watering can to model rainfall.

Elements on the periodic table are arranged by increasing?

What is the difference between molecular formula and molecular model