Answer: ProtonsNeutronsElectrons
What are the components of an atom?

By definition any two atoms with an identical number of protons in their nuclei belong to the same chemical element. Atoms with equal numbers of protons but a different number of neutrons are different isotopes of the same element. For example all hydrogen atoms admit exactly one proton but isotopes exist with no neutrons (hydrogen-1 by far the most common form also called protium) one neutron (deuterium) two neutrons (tritium) and more than two neutrons. The known elements form a set of atomi…

The nucleus was discovered in 1911 as a result of Ernest Rutherford's efforts to test Thomson's "plum pudding model" of the atom. The electron had already been discovered by J.J. Thomson. Knowing that atoms are electrically neutral J.J.Thomson postulated that there must be a positive charge as well. In his plum pudding model Thomson suggested that an atom consisted of negative electrons randomly scattered within a sphere of positive charge. Ernest Rutherford later devised an experiment with his res…

Atomic theory - Wikipedia

One is a grey powder in which for every 100 parts of tin there is 13.5 parts of oxygen. The other oxide is a white powder in which for every 100 parts of tin there is 27 parts of oxygen. 13.5 and 27 form a ratio of 1:2. These oxides are today known as tin (II) oxide …

A hydrogen atom is an atom of the chemical element hydrogen. The electrically neutral atom contains a single positively charged proton and a single negatively charged electron bound to the nucleus by the Coulomb force. Atomic hydrogen constitutes about 75% of the baryonic mass of the universe. ...

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