what is atom

An atom is the basic unit of matter and the specific structure of an element. The term "atoms" comes from the Greek "indivisible" meaning "indivisible" because, at the time, the Greeks considered the atom as the smallest and most indivisible thing in the universe. But we now know that atoms are made up of three types of particles: protons, neutrons, and electrons, and we also know that they also consist of smaller particles (such as quarks). The atom formed after the big bang 13.7 billion years ago. As the warm, dense universe begins to expand, it cools, allowing conditions to form quarks and electrons. Quarks come together to form protons and neutrons that are incorporated into the nucleus. According to CERN, all this happened in the very first minutes of the universe.

It took 380,000 years for the universe to cool down enough to slow down the electrons so that the nucleus could absorb them to form the first atom. The original atoms were hydrogen and helium, which are still the most abundant elements in the universe. Gravity then begins to control the cloud of gas to form stars, which form heavier atoms (this process continues until today), and the death of stars is called (supernova), spreading its precious content In the universe. chemistry analysis

An atom is the smallest unit of matter that contains all the chemical elements of an element. An atom consists of a positively charged proton nucleus, a moderately charged neutron, and a negatively charged electron, all of which run around the nucleus. The typical atomic size of protons and neutrons (if they contain electrons) that compose them is about 0.1 nanometers, and most of them are empty spaces in which we can find electrons; generally, small atoms have a similar shape. What is the sphere? The atom consists of two regions.