How many valence electrons does magnesium (Mg) have?

(A) 12

(B) 6

(C) 3

(D) 2

What is the difference between a substrate, ligand, reactant and product?

Which characteristic is a property of water? A. It is made of polar molecules. B. It has low surface tension. C. It has weak adhesion. D. It is densest as a solid.

What's the easiest way to find balance in a chemical equation? a. Calculus b. Multiply the number of molecules by two, then divide by the number of atoms c. Trial and error

Whats the mass of an atom that contains 28 protons, 28 electron, and 34 neutrons

Why do elements with a higher atomic number tend to be more radioactive

Drinking water may contain a low concentration of lead ion (Pb2) due to corrosion of old lead pipes. The EPA has determined that the maximum safe level of lead ion in water is 15 ppb.

A student examines the temperature and precipitation on a given day using a thermometer and a rain gauge. The student is measuring- A. temperature only B. climate only C. wind speed only D. specific weather conditions

Atoms - 1 2 3 4 Protons - 8 10 9 8 Neutrons - 10 9 9 11 Electrons - 8 10 9 8 Which two are isotopes of one another?

A radioactive isotope has the same number of protons as its stable parent atom, but differs in its number of what?

A student experimentally obtained the density of osmium the densest element as 22.57g/cm3 the density of osmium is reported to be 22.48 g/cm3 determine the student percent error