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BQ 3A News > Blog > USA > How do atoms shape? A physicist explains the place the atoms that make up the whole lot round come from
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How do atoms shape? A physicist explains the place the atoms that make up the whole lot round come from

June 23, 2025
How do atoms shape? A physicist explains the place the atoms that make up the whole lot round come from
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How do atoms shape? – Joshua, age 7, Shoreview, Minnesota

Richard Feynman, a well-known theoretical physicist who gained the Nobel Prize, stated that if he may just go on just one piece of clinical knowledge to long term generations, it could be that every one issues are fabricated from atoms.

Figuring out how atoms shape is a elementary and necessary query, since they make up the whole lot with mass.

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The query of the place atoms comes from calls for numerous physics to be responded totally – or even then, physicists like me best have just right guesses to provide an explanation for how some atoms are shaped.

What’s an atom?

An atom is composed of a heavy heart, known as the nucleus, fabricated from debris known as protons and neutrons. An atom has lighter debris known as electrons that you can imagine as orbiting across the nucleus.

The electrons every raise one unit of destructive rate, the protons every raise one unit of certain rate, and the neutrons don’t have any rate. An atom has the similar collection of protons as electrons, so it’s impartial − it has no total rate.

A diagram of an atom, with protons and neutrons clumped together in the center and ovals representing electron orbits surrounding them.

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An atom is composed of definitely charged protons, neutrally charged neutrons and negatively charged electrons.
AG Caesar/Wikimedia Commons, CC BY-SA

Now, many of the atoms within the universe are the 2 most straightforward sorts: hydrogen, which has one proton, 0 neutrons and one electron; and helium, which has two protons, two neutrons and two electrons. In fact, on Earth there are many atoms but even so those which are simply as commonplace, reminiscent of carbon and oxygen, however I’ll discuss the ones quickly.

A component is what scientists name a bunch of atoms which are the entire identical, as a result of all of them have the similar collection of protons.

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When did the primary atoms shape?

Many of the universe’s hydrogen and helium atoms shaped round 400,000 years after the Large Bang, which is the identify for when scientists assume the universe started, about 14 billion years in the past.

Why did they shape at the moment? Astronomers know from watching far-off exploding stars that the dimensions of the universe has been getting larger for the reason that Large Bang. When the hydrogen and helium atoms first shaped, the universe was once about 1,000 instances smaller than it’s now.

And in keeping with their working out of physics, scientists imagine that the universe was once a lot warmer when it was once smaller.

Prior to this time, the electrons had an excessive amount of calories to settle into orbits across the hydrogen and helium nuclei. So, the hydrogen and helium atoms may just shape best as soon as the universe cooled right down to one thing like 5,000 levels Fahrenheit (2,760 levels Celsius). For ancient causes, this procedure is misleadingly known as recombination − aggregate can be extra descriptive.

The helium and deuterium − a heavier type of hydrogen − nuclei shaped even previous, only some mins after the Large Bang, when the temperature was once above 1 billion F (556 million C). Protons and neutrons can collide and shape nuclei like those best at very excessive temperatures.

Scientists imagine that virtually the entire abnormal topic within the universe is fabricated from about 90% hydrogen atoms and eight% helium atoms.

How do extra huge atoms shape?

So, the hydrogen and helium atoms shaped all through recombination, when the cooler temperature allowed electrons to fall into orbits. However you, I and virtually the whole lot on Earth is fabricated from many extra huge atoms than simply hydrogen and helium. How have been those atoms made?

The unexpected resolution is that extra huge atoms are made in stars. To make atoms with a number of protons and neutrons caught in combination within the nucleus calls for the kind of high-energy collisions that happen in very popular puts. The calories had to shape a heavier nucleus must be big enough to conquer the repulsive electrical drive that certain fees, like two protons, really feel with every different.

A close up of a bright star, which looks like a sphere with some flashes on its surface, against a dark background.

The immense warmth and power in stars can shape atoms via a procedure known as fusion.
NASA/SDO

Protons and neutrons even have some other belongings – roughly like a distinct form of rate – this is sturdy sufficient to bind them in combination as soon as they may be able to get very shut in combination. This belongings is named the sturdy drive, and the method that sticks those debris in combination is named fusion.

Scientists imagine that many of the components from carbon as much as iron are fused in stars heavier than our Solar, the place the temperature can exceed 1 billion F (556 million C) – the similar temperature that the universe was once when it was once only some mins previous.

The periodic table of elements, color-coded by how each element formed. Lighter elements formed by cosmic ray fission or exploding stars, while larger elements formed by merging neurtron stars or dying low mass stars. Hydrogen and Helium formed through Big Bang fusion.

This periodic desk displays which astronomical processes scientists imagine are chargeable for forming every of the weather.
Cmglee/Wikimedia Commons (symbol) and Jennifer Johnson/OSU (information), CC BY-SA

However even in sizzling stars, components heavier than iron and nickel gained’t shape. Those require additional calories, for the reason that heavier components can extra simply smash into items.

In a dramatic match known as a supernova, the internal core of a heavy superstar collapses after it runs out of gas to burn. All through the robust explosion this cave in triggers, components which are heavier than iron can shape and get ejected out into the universe.

Astronomers are nonetheless understanding the main points of alternative unbelievable stellar occasions that shape higher atoms. As an example, colliding neutron stars can liberate huge quantities of calories – and components reminiscent of gold – on their option to forming black holes.

Figuring out how atoms are made simply calls for studying slightly basic relativity, plus some nuclear, particle and atomic physics. However to complicate issues, there may be different stuff within the universe that doesn’t seem to be comprised of commonplace atoms in any respect, known as darkish topic. Scientists are investigating what darkish topic is and the way it would shape.

And because interest has no age restrict – adults, tell us what you’re questioning, too. We gained’t be capable to resolution each and every query, however we can do our perfect.

TAGGED:atomsexplainsformphysicist
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