Correct answer= "Element"
Element is the simplest type of matter; the basic unit from which all
other matter is built
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An atom is the simplest form of matter, consisting of a nucleus made up of protons and neutrons, surrounded by electrons.
The simplest form of matter is an atom. Atoms are composed of protons, neutrons, and electrons.
An atom is the simplest form of matter that has a unique set of properties. Each type of atom is characterized by a specific number of protons in its nucleus, which determines its chemical properties.
An atom of the chemical element called hydrogen is the simplest form of matter. It consists of one proton and one electron, making it the building block of all other elements in the periodic table.
Carbon, hydrogen, and oxygen are classified as elements. Elements are the simplest form of matter, consisting of atoms with a specific number of protons in their nuclei.
An element is one of 115 on the periodic table. A liquid is made up of atoms, of a specific element, or compound of elements, loosely compacted together. There is gaps enough between the atoms, that they can slide past each other. In this case element is the simplest form of matter. However, an element is made up of one atom of that element, which contains protons, neutrons and electrons, specific to the elements placement on the periodic table. (Hydrogen is 1, therefore it has one proton and one electron. Further in, protons, electrons and neutrons can be comprised of quarks, neutrinos etc. but this is higher level physics and chemistry.