This microcredential represents educators' effective and consistent instruction on body image and eating disorders (anorexia, bulimia, binge-eating disorder). This is the second microcredential in the Nutrition Stack. This stack of microcredentials fulfills one of the requirements of a pathway for endorsement.

This task examines linear models for the boiling point of water as a function of elevation. Two sets of data are provided and each is modeled quite well by a linear function.

Dr. Michihiko Hachiya lived through August 6, 1945 when the atomic bomb was dropped on Hiroshim. He kept a diary of his experience. He served as Director of the Hiroshima Communications Hospital and lived near the hospital approximately a mile from the explosion's epicenter. His diary was published in English in 1955.

Depicts millions of aluminum atoms. An atom is the smallest part of an element that still has all the properties of that element.

Lead and gold atoms differ from one another because they have different numbers of neutrons, protons, and electrons.

Two hydrogen atoms form a simple covalent bond. Each atom has a single electron. When the atoms bond, they share electrons and fill their outermost energy level.

Atoms bond in ways that make their outermost energy levels complete with electrons, which stabilizes atoms.

A chemical compound is made up of two or more elements that are chemically combined or bonded. The combining of atoms to form new substances is called chemical bonding.

In covalent bonds, electrons are shared between two different atoms. Atoms are held together by the force of attraction between the positively charged nucleus and the shared electrons.

Many ionic compounds form a regular repeating pattern called a crystal lattice. Salt crystals have a crystal lattice that forms a cubic shape.

Niels Bohr discovered that electrons are arranged in energy levels. Each energy level can hold certain numbers of electrons. The first can hold 2, the second can hold up to 8, and the 3rd can hold up to 18.

An atom is the smallest part of an element that still has all the properties of that element. Each different element is made up of a different kind of atom.

Hydrogen has a covalent bond with chlorine, which has seven electrons in its outermost energy level. When they bond, both outer energy levels become complete.

In ionic bonding, oppositely charged ions are attracted to each other. In this animation, the sodium atom has one electron in its outermost level and the chlorine atom has seven electrons in its outermost layer.

In a metallic bond, positively charged ions are surrounded by a sea of electrons, which are attracted to multiple nuclei at the same time. Outer electrons tend to be very mobile.

When an atom has an equal number of positively charge protons and negatively charged electrons, it has a neutral charge.

Atoms contain three types of subatomic particles: protons, which have a positive charge; neutrons, which have a neutral charge; and electrons, which have a negative charge.