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Apr 11, 2024 · In chemistry and physics, the atomic theory explains how our understanding of the atom has changed over time. Atoms were once thought to be the smallest pieces of matter. However, it is now known that atoms are made up of protons, neutrons, and electrons. These subatomic particles are made up of quarks.
The Atom. Science >> Chemistry for Kids. The atom is the basic building block for all matter in the universe. Atoms are extremely small and are made up of a few even smaller particles. The basic particles that make up an atom are electrons, protons, and neutrons. Atoms fit together with other atoms to make up matter.
An atom is the smallest unit of an element, and each chemical element has a unique atomic number. For instance, hydrogen has an atomic number of 1 because every hydrogen atom has one proton in its nucleus. No other element has an atomic number of 1. Two other related properties of atoms are the mass number and the atomic weight.
Biology library > Chemistry of life > Elements and atoms. Introduction to the atom. Google Classroom. About. Transcript. Learn how atoms are made up of protons, neutrons, and electrons. Elements are defined by the atomic number, the number of protons in the nucleus. The mass of an atom is determined by the total number of protons and neutrons.
- 21 min
- Sal Khan
- Why doesn't light pass through objects if 99.99% is nothing or free space?Because light interacts with the electromagnetic fields the objects generate. Some objects (like glass) easily allow light through, some do not.
- what is the free space made up of?Free space is made up of absolutely nothing.
- If you were to use a knife to cut a piece of string, would there be a chance of an atom and its elec...no, as an atom completely splitting apart is nuclear fission.. and that causes chain reactions... thats why its not possible unless atoms collide i...
- If a piece of string is mostly free space, then how come we can pull it without it breaking?The same force which is keeping the string together in the first place. The chemical bonding in the string between individual atoms forms the strin...
- Aren't atoms made up of smaller pieces? It has to be made up of SOMETHING right? Could someone show ...http://htwins.net/scale2/ That's a link for a scale of the universe. It's quite interesting actually.
- If you were somehow able to, what would you get if you got rid of all the free space in an atom and ...Its called a singularity, otherwise known as a black hole.
- How do we know the average mass number of elements on earth? Is it just an estimate of sorts?Yeah, basically. We assume a more or less random distribution of the elements throughout the earth, so in any given sample, we just need to have en...
- why do we see and feel things like a wall or a table as a solid object when they are really mostly f...Basic rundown: The negatively charged atoms in your hand are repelling the ones in the table.
- I had a doubt. Sal says that all of the protons stay inside the nucleus. But if there are protons st...You are quite correct, the protons DO repel each other due to having like electromagnetic charges. However, there is another force at work. It is c...
Dalton's atomic theory. Google Classroom. The postulates of Dalton's atomic theory: which points do we still use today, and what have we learned since Dalton? Key Points. Dalton's atomic theory was the first complete attempt to describe all matter in terms of atoms and their properties.
Niels Bohr was a Danish physicist known for making a model of the atom. His model helped explain how atoms are structured and how the parts of atoms behave. He received the Nobel Prize in physics for his work on atoms.
