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|group=1 |period=3

|period=3 |density gpcm3nrt=(white) 1.823, (red) ≈ 2.2 – 2.34, (violet) 2.36, (black) 2.69

| [[Period 1 element|'''1''']] || [[عناصر الدورة الأولى|'''1''']]

{| class="wikitable" border="1" * thermionic fuel element(tfe)

{| class="wikitable" border="1" * latent period

{| class="wikitable" border="1" * natural element

{| class="wikitable" border="1" * half-age period

{| class="wikitable" border="1" * element

{| class="wikitable" border="1" * parent element

* ICE (1) Institute of Civil Engineers. (2) Internal combustion engine.... * impingement (1) The entrapment of .sh and other marine life on the surface of an intake sc

* 1.2 gallons (U.S.) or 4.546 liters. gallons per .ush The number of gallons us * gate valve A valve with a disk-shaped closing element that slides over the opening through which water .ows.

{| class="wikitable" border="1" *boundary element method

...RAC Radiation Advisory Committee. race track See “oxidation ditch.” RACM (1) See “reasonably available control measures (RACM).” (2) See “regu­

* fathom A marine unit of length equal to 6 feet (1.8 m). ...he volume of water applied to a .lter per unit of surface area in a stated period of time.

...a crest length of at least 500 meters with a reservoir volume of at least 1 million cubic meters. * latency period The time elapsing from the .rst exposure of a chemical until the appearance

* ABS (1) Acrylonitrile-butadiene-styrene. A black plastic material, used in the man * ACH (1) See “air changes per hour (ACH).” (2) See “aluminum chlorohydrate (A

...ound level The concentration of pollutants in a de.nite area during a .xed period of time prior to starting up a source of emission undercontrol. * BAF (1) See “biologically active .lter.” (2) Biologically activated foam.

...A process for killing pathogenic organisms by applying heat for a speci.c period of time. * PE (1) Professional engineer. (2) See “population equivalent (PE).”

...air sampling, the average air concentration of contaminants during a given period. * ton container A 1-ton chlorine storage container.

* cadmium (Cd) A heavy metal element that accumulates in the environment. * calandria The heating element in an evaporator consisting of vertical tubes which act as the heating surf