In chemistry and physics, an atom is the smallest particle of a chemical element that retains its chemical properties.
An atom consists of a dense nucleus of positively-charged protons and electrically-neutral neutrons, surrounded by a much larger electron cloud consisting of negatively-charged electrons.
What is an atom simple definition?
The definition of an atom is the smallest component of an element, characterized by a sharing of the chemical properties of the element and a nucleus with neutrons, protons and electrons.
What is Atom and example?
Neutrons have the same mass as protons but a neutral charge. The element helium, for example, contains atoms with two protons in the nucleus. The element iron contains atoms with 26 protons. The element oxygen contains atoms with eight protons. And the element gold contains atoms with 79 protons.
What are atoms for kids?
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.
What are the 4 types of atoms?
Different Kinds of Atoms
- Description. Atoms are made of tiny particles called protons, neutrons and electrons.
- Stable. Most atoms are stable.
- Isotopes. Every atom is a chemical element, like hydrogen, iron or chlorine.
- Radioactive. Some atoms have too many neutrons in the nucleus, which makes them unstable.
What is the best definition of an atom?
An atom is a particle of matter that uniquely defines achemical element. An atom consists of a central nucleus that is usually surrounded by one or more electrons. Each electron is negatively charged. The nucleus is positively charged, and contains one or more relatively heavy particles known as protons and neutrons.
What is called Atom?
An atom a fundamental piece of matter. An atom itself is made up of three tiny kinds of particles called subatomic particles: protons, neutrons, and electrons. The protons and the neutrons make up the center of the atom called the nucleus and the electrons fly around above the nucleus in a small cloud.
Where can u find atoms?
Electrons are the smallest of the three particles that make up atoms. Electrons are found in shells or orbitals that surround the nucleus of an atom. Protons and neutrons are found in the nucleus. They group together in the center of the atom.
Is water an atom?
Water is a molecule because it contains molecular bonds. Water is also a compound because it is made from more than one kind of element (oxygen and hydrogen). It is not a compound because it is made from atoms of only one element – oxygen.
Can atoms be created?
We now know that atoms are made up of three particles: protons, neutrons and electrons — which are composed of even smaller particles, such as quarks. Atoms were created after the Big Bang 13.7 billion years ago. As the hot, dense new universe cooled, conditions became suitable for quarks and electrons to form.