The number of protons of an element is constant, but the number of neutrons can change. Isotopes are atoms of the same element with different numbers of neutrons.
Carbon can exist as carbon 12 or carbon 14.
Compounds are formed by joining atoms of two or more elements. In this animation an ionic bond holds atoms together.
Atoms of the same element are exactly alike. This animation depicts a copper atom.
Introduce students to atoms with an engaging Google Slides and Cornell Notes activity. Image: jayofboy - https://www.freeimages.com/photo/atom-1307057
The four atoms depicted here have a different atomic number, which refers to the number of protons in the nucleus. The atomic number of helium is 2, aluminum is 13, hydrogen is 1, and oxygen is 8.
Matter, such as this ice cream, is made up of many atoms.
Replicates the experiments J.J. Thomson conducted to develop his model of an atom. Light is produced when an electric current is passed through a tube. When a magnetic charge is introduced, the rays are deflected.
Like charges repel one another.
The mass number of an atom is the sum of its protons and neutrons. The mass number of sulfur is 32.
The mass number of an atom is the sum of its protons and neutrons.
The nucleus is the dense core of an atom. It contains over 99 percent of the mass of an atom, but occupies a miniscule amount of the space.
In Rutherford's model of an atom, positively charged particles are concentrated in a small, dense center of an atom called the nucleus. Negatively charged electrons are scattered around the nucleus.
Electrons are precisely one two-thousandth of the mass of a proton or neutron.
The nucleus of an atom contains positively charged protons and neutrally charged neutrons. Negatively charged electrons orbit the nucleus.
This video segment adapted from A Science Odyssey takes a look at the scale of the atom and the tremendous amount of space between the electrons and the nucleus. If all this empty space exists in matter, how can any substance be solid?
This interactive map allows students to see how the attack on Pearl Harbor occurred with pictures, oral testimony, and timeline of events.
In this episode of UEN's PDTV, preservice teachers Aniston and Mallory reflect on their first professional conference at the Utah Coalition for Educational Technology (UCET) annual event. They’ll share their top ten tips for conference preparation, and through their insights, you’ll learn how to maximize your next professional conference experience.
Many online sources are untrustworthy. The attention conservation poster reminds students to seek out credible online sources and not waste their time on untrustworthy ones. Note: A free educator account is required to access these materials.
Novel representations and diverse perspectives can reveal new insights into complex systems, and can support rich understandings of the world. In this activity, students will identify and analyze the choices artists and scientists make when creating representations of living or non-living natural objects. This process will help students recognize the potential and place for their own articulation of how the world works. After drawing from nature, students will reflect on the process of representing information, then compare their drawings with that of a 16th-century artist. Students will consider what is included and what is excluded, and hypothesize about larger contexts and systems.