What number uniquely identifies an element

The retention time (tr) and peak width (w) for compounds A and B are given after chromatographic separation using five different experimental parameters.

A laboratory procedure calls for making 410.0mL of a 1.2M NaNO3 solution. What mass of NaNO3 (in g) is needed?

How many protons z and how many neutrons n are there in a nucleus of the most common isotope of silicon, 2814si?

In the United States, volume of irrigation water is usually expressed in acre-feet. One acre-foot is a volume of water sufficient to cover 1 acre of land to a depth of 1 ft (640 acres = 1 mi2, 1 mi = 5280 ft).

Place the following in order of increasing F-A-F bond angle, where A represents the central atom in each molecule.

What are the common elements in a canyon?

How many carbons atoms are in propane?

This type of formula indicates the kind, number, arrangement, and bonds but not the unshared pairs of the atoms in a molecule.

What does the water inside the jar represent

What is solubility? 1) solubility is how much solute will precipitate out of solvent 2) solubility is how much solvent will dissolve in solute 3) solubility is how much solid only will dissolve in liquid only