Dictionary entry details

This is a list of chemical elements, sorted by atomic mass (or most stable isotope) and color coded according to type of element. Each element's atomic number, name, element symbol, and group and period numbers on the periodic table are given. The number in parenthesis gives the uncertainty in the 'concise notation' dis given in parenthesis next to the least significant digits to which it. Atomic Number of Elements from 1 to 50. List of first 50 elements of the periodic table by atomic number including the chemical symbol and the atomic weight. You can print the list of elements by hitting the print button below. Calcium is a chemical element with the symbol Ca and atomic number 20. As an alkaline earth metal, calcium is a reactive metal that forms a dark oxide-nitride layer when exposed to air. Its physical and chemical properties are most similar to its heavier homologues strontium and barium.

Atomic mass: The mass of an atom is primarily determined by the number of protons and neutrons in its nucleus. Affinity photo ipad air. Atomic mass is measured in Atomic Mass Units (amu) which are scaled relative to carbon, 12 C, that is taken as a standard element with an atomic mass of 12. A neutral atom with atomic number 20 will have 20 electrons. The atomic number is, by definiton, the number of protons in an atom's nucleus but for a neutral atom it's also equal to the number of electrons. Each element has a different, unique number of protons that determines its identity.

• ATOMIC NUMBER 20(noun)

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Meaning:

A white metallic element that burns with a brilliant light; the fifth most abundant element in the earth's crust; an important component of most plants and animals

Classified under:

Nouns denoting substances

Synonyms:

atomic number 20; Ca; calcium

Hypernyms ('atomic number 20' is a kind of..):

Atomic Number Chart

metal; metallic element (any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.)

Evernote daily journal template. Hyponyms (each of the following is a kind of 'atomic number 20'):

calcium ion; factor IV (ion of calcium; a factor in the clotting of blood)

Atomic Number 205

Holonyms ('atomic number 20' is a substance of..):

fluor; fluorite; fluorspar (a soft mineral (calcium fluoride) that is fluorescent in ultraviolet light; chief source of fluorine)

gypsum (a common white or colorless mineral (hydrated calcium sulphate) used to make cements and plasters (especially plaster of Paris))

burnt lime; calcined lime; calcium oxide; calx; fluxing lime; lime; quicklime; unslaked lime (a white crystalline oxide used in the production of calcium hydroxide)

limestone (a sedimentary rock consisting mainly of calcium that was deposited by the remains of marine animals)