Because H-2 has one proton and one neutron, its mass is 2.
Babies have about 300 bones at birth, with cartilage between many of them.
An atom is the smallest constituent unit of ordinary matter that has the properties of a chemical element.
Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms.
But how can we possibly talk about the age of the universe if everything in it has its own personal time?
The short answer is: almost everything is about the same age.
This is because both the protons and the neutrons in an atom have a relatively equal mass.
During this process, carbon dioxide and water are converted into energy, releasing oxygen as a by-product.
An illustration of the helium atom, depicting the nucleus (pink) and the electron cloud distribution (black).
If you have two identically functioning clocks, you can start them together, move them to different locations or along different paths, then when you physically bring them back together to compare, they will literally have registered different amounts of time. And , cosmologists are always talking about the age of the universe (a mere 13.80±0.02 billion years young).
When talking about the age of the universe we’re talking about the age of everything in it.