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Atoms consist of a nucleus of protons and neutrons (the vast majority of its mass) surrounded by a cloud of electrons. In neutrally-charged ions the number of electrons equals the number of protons. The mass of an atom is the sum of the neutrons and protons, whereas the atomic number is dictated by the number of protons alone. An atom with a single proton is hydrogen, and all hydrogen atoms possess a single proton in their nucleus. Helium must have two protons, lithium three, and so on.
Atoms (essentially indivisible elements) combine to form molecules via sharing electrons.
The main three ideas in the nuclear theory of the atom :
1. An atom is electrically neutral, so the number of negative particles (electrons) is equal to the number of positive particles (protons).
2. An atom is almost entirely empty space, but may be occupied by extremely small, negatively-charged particles called electrons.
3. The positive charge of an atom is located in the center of the atom (the nucleus) which also contains nearly all of the mass of the atom.
What else can I help you with?
What is the main concept behind this theory?
The rock cycle?
What are the Criticisms of Robert Gagne theory?
The main criticism is that the theory does not apply to all students. It is also not a theory that is well taken by many teachers.
What are the two types of main idea?
The two types of main ideas are stated and implied ones.
What are the different parts of an atom and what kind of charge does each part have?
Atoms are made of three main particles: protons, neutrons and electrons. Electrons have negative charge, are very small (even for subatomic particles) and orbit the center of the atom, which contains the protons and neutrons. Protons have positive charge, and are held by strong nuclear force to the neutrons, which are neutral (no charge).
What is Found in the nucleus of the atom?
Protons and Neutrons are the main fundamental particles but physicists and nuclear chemists also believe that there are many other minor particles eg neutrinos, quarks, muons, positrons to mention a few. Higgs-boson particles??
What were the two main factors of Bohr's atomic theory?
- an atom has a positive charge in the nucleus and a negative charge in the electron cloud; the atom is normally neutral- these charges are separated
How did Albert Einstein make the atom?
Albert Einstein did not make the atom. He was a theoretical physicist who made significant contributions to our understanding of the atom through his work on the theory of relativity and his explanation of the photoelectric effect. He did not create or discover the atom itself.
What is the name of the reaction that occurs in a nuclear reactors core?
The main reaction that occurs in a nuclear reactor core is nuclear fission. In this reaction, the nucleus of an atom is split into smaller parts, releasing large amounts of energy in the form of heat. This heat is then used to generate electricity in the reactor.
Which is not one of Darwin's four main ideas?
A common misconception is that Darwin proposed four main ideas, commonly referred to as the 4 main postulates of Darwinian evolution. However, Darwin did not explicitly outline four specific ideas in his work. Instead, his theory of evolution by natural selection encompasses multiple concepts such as variation, competition, adaptation, and descent with modification.
What are the proponent of psychoanalytic theory?
The main proponent of psychoanalytic theory is Sigmund Freud. He developed this theory which emphasizes the role of unconscious conflicts and desires in shaping human behavior and personality. Freud's ideas have had a significant influence on psychology and continue to be studied and debated in the field.
What are unstated main ideas?
unstated main ideas are statements that have no topic.
Who proposed the theory of relativity?
Albert Einstein!
What was the main discovery of Rutherford's gold foil experiment?
The main discovery of Rutherford's gold foil experiment was that atoms have a small, dense, positively charged nucleus at their center. This led to the development of the nuclear model of the atom, where electrons orbit a positively charged nucleus.
What was democritus's contribution to physics?
Democritus's main contribution to physics was discovery of the atom. He devoted his life to finding out as much as possible to create what is thought to be the first atomic theory.
What are the MAIN ideas in the gilded age?
Two the main ideas were Businesses and Politics
What is the main flaw in dalton theory?
The main flaw in Dalton's atomic theory is the assumption that atoms are indivisible and indestructible. Subsequent scientific discoveries revealed that atoms can be broken down into subatomic particles (protons, neutrons, and electrons) and can undergo nuclear reactions. Additionally, Dalton's theory does not account for the existence of isotopes, which are atoms of the same element with different masses due to varying numbers of neutrons.
What was Hahn's contribution to the atom?
Heisenberg along with Schrodinger formulated Quantum Mechanics, it is the theory that replaces classic Newtonian mechanics in the world of atoms and molecules. Heisenberg also played a significant role in propelling the world into the nuclear age. After the war, German scientists including Heisenberg took credit for diverting the regime from pursuing a bomb, for moral as well as practical reasons.
