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1 day ago · Bibliography. Further reading. External links. Atoms are the basic particles of the chemical elements. An atom consists of a nucleus of protons and generally neutrons, surrounded by an electromagnetically bound swarm of electrons. The chemical elements are distinguished from each other by the number of protons that are in their atoms.
- 1.67×10−27 to 4.52×10−25 kg
- zero (neutral), or ion charge
4 days ago · Atom, smallest unit into which matter can be divided without the release of electrically charged particles. It also is the smallest unit of matter that has the characteristic properties of a chemical element. As such, the atom is the basic building block of chemistry.
- What is an atom?An atom is the basic building block of chemistry. It is the smallest unit into which matter can be divided without the release of electrically char...
- Are all atoms the same size?All atoms are roughly the same size, whether they have 3 or 90 electrons. Approximately 50 million atoms of solid matter lined up in a row would me...
- What does the mass of an atom consist of?The mass of an atom consists of the mass of the nucleus plus that of the electrons. That means the atomic mass unit is not exactly the same as the...
- How is the atomic number of an atom defined?The single most important characteristic of an atom is its atomic number (usually denoted by the letter Z), which is defined as the number of units...
1 day ago · Chemical symbol. The periodic table, elements being denoted by their symbols. Chemical symbols are the abbreviations used in chemistry, mainly for chemical elements; but also for functional groups, chemical compounds, and other entities. Element symbols for chemical elements normally consist of one or two letters from the Latin alphabet and are ...
4 days ago · Electron configurations of the elements (data page) This page shows the electron configurations of the neutral gaseous atoms in their ground states. For each atom the subshells are given first in concise form, then with all subshells written out, followed by the number of electrons per shell.
Updated on May 19, 2024. You may assume the valences of the chemical elements—the number of electrons with which an atom will bond or form—are those that can be derived by looking at the groups (columns) of the periodic table. While these are the most common valences, the real behavior of electrons is less simple.
2 days ago · gold (Au), chemical element, a dense lustrous yellow precious metal of Group 11 (Ib), Period 6, of the periodic table of the elements. Gold has several qualities that have made it exceptionally valuable throughout history.
2 days ago · Promethium is the most elusive member of the lanthanide family, a row of 15 metals marooned in the periodic table’s southern territories. Discovered in 1945, the element was named after the ...
