EUdict (European dictionary) is a collection of online dictionaries for the languages spoken mostly in Europe. These dictionaries are the result of the work of many authors who worked very hard and finally offered their product free of charge on the internet thus making it easier to all of us to communicate with each other. Some of the dictionaries have only a few thousand words, others have more than 320,000. Some of the words may be incorrectly translated or mistyped.
Esperanto is only partially translated. Please help us improve this site by translating its interface.
Chromium, Cr, atomic number 24 (noun) a hard brittle multivalent metallic element; resistant to corrosion and tarnishing How to pronounce atomic number 24? Write down the number of valence electrons of element A (atomic number = 13) and element B (atomic number = 12) respectively:. (1 Point) Enter your answer 25. In HCP crystal system, write down the number of the unit cells that share the atom existed.
Total number of language pairs: 494
Total number of translations (in millions): 14.4
New: Japanese (Kanji)<>Russian
Improved: English<>Portuguese, English<>Spanish, Portuguese<>Spanish
Options
There are several ways to use this dictionary. The most common way is by word input (you must know which language the word is in) but you can also use your browser's search box and bookmarklets (or favelets).
Look at the complete list of languages: Available language pairs
There are two Japanese-English (and Japanese-French) dictionaries and one contains Kanji and Kana (Kana in English and French pair due to improved searching). For the same reason the Chinese dictionary contains traditional and simplified Chinese terms on one side and Pinyin and English terms on the other.
Browser integration (Search plugins)
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Atomic Number 24 Element
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Instead of clicking the Search button, just press Enter. Although EUdict can't translate complete sentences, it can translate several words at once if you separate them with spaces or commas. Sometimes you can find translation results directly from Google by typing: eudict word. If you are searching for a word in Japanese (Kanji) dictionary and not receiving any results, try without Kana (term in brackets). If you are searching for a word in the Chinese dictionary and not receiving any results, try without Pinyin (term in brackets). Disable spellchecking in Firefox by going to Tools → Options → Advanced → Check my spelling as I type. Why not add a EUdict search form to your web site? Form
Credits
My name is Tomislav Kuzmic, I live in Croatia and this site is my personal project. I am responsible for the concept, design, programming and development. I do this in my spare time. To contact me for any reason please send me an email to tkuzmic at gmail dot com. Let me take this chance to thank all who contributed to the making of these dictionaries and improving the site's quality:
- Goran Igaly – author of the initial English-Croatian database
- Natali Kralj – author of the Dutch-Croatian dictionary
- Jim Breen – author of the Japanese-English dictionary
- Besiki Sisauri – author of the English-Georgian dictionary
- Giorgi Chavchanidze – author of the several Georgian dictionaries
- Jerzy Kazojć – for excellent dictionaries collection
- Rajesh – for help with English-Tamil and German-Tamil dictionary
- Chinese-German dictionary adapted from: 'The free Chinese-German dictionary'
- Grazio Falzon – author of the English-Maltese dictionary
- András Tuna – for smart suggestions about improving this site
- Interface translation: Tomislav Kuzmić (Croatian), Vasudevan Tirumurti, Fahim Razick (Tamil), Matti Tapanainen (Finnish), Ebru Bağlan (Turkish), Arsene Ionuț, Cristina Crisan (Romanian), Daiva Macijauskė (Lithuanian), Tetiana M. (Ukrainian), András Tuna (Hungarian), Jakob Lautrup Nysom (Danish), Andre Abdullin, Elena Zvaritch (Russian), Catherine Györvàry (French), Gab M., Klaus Röthig (Portuguese), Marcin Orzełek (Polish), Stefanija Madzoska, Daniel Matrakoski (Macedonian), Selina Lüdecke, P. H. Claus (German), Vangelis Katsoulas (Greek), Roberto Marchesi (Italian), Robin van der Vliet (Esperanto), Reno Rake (Indonesian), Nahuel Rodríguez (Spanish), Gao Pan (Chinese), Hoài Sang Lăng (Vietnamese)
EUdict is online since May 9, 2005 and English<>Croatian dictionary on tkuzmic.com since June 16, 2003.
Learning Objective
- Determine the relationship between the mass number of an atom, its atomic number, its atomic mass, and its number of subatomic particles
Key Points
- Neutral atoms of each element contain an equal number of protons and electrons.
- The number of protons determines an element’s atomic number and is used to distinguish one element from another.
- The number of neutrons is variable, resulting in isotopes, which are different forms of the same atom that vary only in the number of neutrons they possess.
- Together, the number of protons and the number of neutrons determine an element’s mass number.
- Since an element’s isotopes have slightly different mass numbers, the atomic mass is calculated by obtaining the mean of the mass numbers for its isotopes.
Terms
- atomic massThe average mass of an atom, taking into account all its naturally occurring isotopes.
- mass numberThe sum of the number of protons and the number of neutrons in an atom.
- atomic numberThe number of protons in an atom.
Atomic Number
Neutral atoms of an element contain an equal number of protons and electrons. The number of protons determines an element’s atomic number (Z) and distinguishes one element from another. For example, carbon’s atomic number (Z) is 6 because it has 6 protons. The number of neutrons can vary to produce isotopes, which are atoms of the same element that have different numbers of neutrons. The number of electrons can also be different in atoms of the same element, thus producing ions (charged atoms). For instance, iron, Fe, can exist in its neutral state, or in the +2 and +3 ionic states.
Mass Number
An element’s mass number (A) is the sum of the number of protons and the number of neutrons. The small contribution of mass from electrons is disregarded in calculating the mass number. This approximation of mass can be used to easily calculate how many neutrons an element has by simply subtracting the number of protons from the mass number. Protons and neutrons both weigh about one atomic mass unit or amu. Isotopes of the same element will have the same atomic number but different mass numbers.
Scientists determine the atomic mass by calculating the mean of the mass numbers for its naturally-occurring isotopes. Often, the resulting number contains a decimal. For example, the atomic mass of chlorine (Cl) is 35.45 amu because chlorine is composed of several isotopes, some (the majority) with an atomic mass of 35 amu (17 protons and 18 neutrons) and some with an atomic mass of 37 amu (17 protons and 20 neutrons).
Atomic Number 242
Given an atomic number (Z) and mass number (A), you can find the number of protons, neutrons, and electrons in a neutral atom. For example, a lithium atom (Z=3, A=7 amu) contains three protons (found from Z), three electrons (as the number of protons is equal to the number of electrons in an atom), and four neutrons (7 – 3 = 4).
Show SourcesBoundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
http://www.boundless.com/
Boundless Learning
CC BY-SA 3.0.
Atomic Number 24
http://en.wiktionary.org/wiki/atomic_number
Wiktionary
CC BY-SA 3.0.
http://www.boundless.com//biology/definition/atomic-mass–2
Boundless Learning
CC BY-SA 3.0.
http://en.wikibooks.org/wiki/A-level_Chemistry/OCR/Atoms,_Bonds_and_Groups/Atoms_and_Reactions/Atoms
Wikibooks
CC BY-SA 3.0.
Element With Atomic Number 17
http://cnx.org/content/m44390/latest/?collection=col11448/latest
OpenStax CNX
CC BY 3.0.