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ID number:884173
Author:
Evaluation:
Published: 14.04.2009.
Language: Latvian
Level: Secondary school
Literature: n/a
References: Not used
Extract

Atoms (grieķu: άτομον, "atomos" - nedalāms) ir vielas pamatvienība, kuru pamatā veido atoma kodols, kam apkārt riņķo negatīvi uzlādēts elektronu mākonis. Atoma kodols sastāv no pozitīvi lādētu protonu un elektriski neitrālu neitronu sajaukuma.

Atoma uzbūve:
elektroni ir negatīvi lādēti; elektrons ir visvieglākā atoma sastāvdaļa- tā masa ir aptuveni 1/1836 no protona masas. Elektronu mijiedarbība ar citiem atomiem nosaka ķīmisko saišu veidošanos un ir ķīmijas pamats;
neitroni, kam nav lādiņa - tie ir neitrāli; to masa ir aptuveni 1838 reizes lielāka par elektrona masu;
protoni, kas ir pozitīvi lādēti; protonu masa ir aptuveni 1836 reizes lielāka par elektrona masu jeb vienāda ar neitrona masu. To skaits nosaka ķīmiskā elementa piederību jeb - nosaukumu.

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