Shopping on line can be easy, simple and save you lots of money. It can also take a lot of your time, frustrate you, and result in unwanted purchases. Now the same can be said for regular high street shopping, but with the vast opportunity presented by the Internet it will pay you to spend a few minutes reading this and understanding how to better optimize your Atomic Number shopping experience:
1. Compare - without doubt the biggest advantage that the Atomic Number offers shoppers today is the ability to compare thousands of Atomic Number at a time. This is a great thing, but not necessarily all the time! Too much can be daunting at times so take advantage of the great comparison sites and where possible let them do the hard work for you.
2. Research - if it has been said it will be on the internet. Ignorance is no longer a justifiable reason for buying the wrong thing. Take the time to research in detail everything that you could possible want to know about
3. Testimonials - don't know anybody that has bought a Atomic Number? Wrong! If the Atomic Number is good the internet will let you know. Use the Internet as a friend and get testimonials before you buy.
4. Questions - Got a question about Atomic Number then search the Forums, FAQ's, Blogs etc. Don't be afraid to ask .....
5. Reputation - Never heard of the company selling Atomic Number? Don't worry, no reason why you should know every company in the world, but you know someone that does! Use the internet to find out what people are saying about Atomic Number and build up a picture of their reputation for sales, returns, customer service, delivery etc.
6. Returns - still worried that even after all of the above your Atomic Number wont be what you want? Check out the returns policy. There is so much competition now that someone, somewhere is bound to offer the terms that you are comfortable with.
7. Feedback - happy with your Atomic Number then let people know, after all you are depending on others people input in your buying decision, so why not give a little back.
8. Security - check for the yellow padlock on the Atomic Number site before you buy, and the s after http:/ /i.e. https:// = a secure site
9. Contact - got a question about Atomic Number, or want to leave a comment then check out the sites contact page. Reputable companies have them and respond.
10. Payment - ready to pay for your Atomic Number, then use your credit card or PayPal! Be aware of companies that don't accept them, there may be genuine reasons but given the huge amount of choice you have when buying online there is no reason at all not to buy via credit card or PayPal.
See also: List of elements by atomic numberIn
chemistry and physics, the
atomic number (also known as the
proton number) is the number of
protons found in the
atomic nucleus of an atom. It is traditionally represented by the symbol
Z. The atomic number uniquely identifies a
chemical element. In an atom of
electric charge, the number of electrons also equals the atomic number.
The atomic number is closely related to the
mass number, which is the number of protons and neutrons in the nucleus of an atom. The mass number defines the isotope of the element and often comes after the name of the element, e.g. carbon-14 (used in
carbon dating).
History
The atomic number originally meant the number of an element's place in the periodic table.
Dmitri Mendeleev arranged the known elements in increasing order of
atomic weight and grouped by their similar chemical properties The Periodic Table of Elements (American Institute of Physics). However, placing the elements in strict order of atomic weight resulted in some mismatches.
Iodine and
tellurium, if listed by atomic weight, appeared to be in the wrong order; and would fit better by chemical properties if their places in the table were swapped The Development of the Periodic Table (Chemsoc). Placing them in the order which fit their properties most closely, their number in the table was their atomic number. This number appeared to be related to the mass of the atom but, as the discrepancy showed, reflected some property other than mass.
The anomalies in this sequence were finally explained after research by Henry Moseley in 1913 Ordering the Elements in the Periodic Table (Chemsoc). Moseley discovered a strict relationship between the
x-ray diffraction spectra of elements, and their correct location in the periodic table. This led to the conclusion that the atomic number corresponds to the
electric charge of the nucleus — the charge of the protons. The atomic number is the number of protons that is equal to the number of electrons.
Chemical properties
Each element has a specific set of chemical properties as a consequence of the number of protons in its nucleus. The charge of an atom's nucleus defines its
electron configuration based on principles of
quantum mechanics. The form of each element's Electron shell, particularly the valence shell, is the primary factor in determining its
chemical bonding behavior.
New elements
The quest for new elements is usually described using atomic number. As of early 2007, elements with atomic numbers through 118 (excluding 117) have been discovered. Synthesis of new elements is accomplished by bombarding target atoms of heavy elements with ions, such that the sum of the atomic numbers of the target and ion elements equals the atomic number of the element being created. In general, the
half-life becomes shorter as atomic number increases, though an "island of stability" may exist for undiscovered isotopes with certain numbers of protons and neutrons.
See also
Notes
See also: List of elements by atomic number
In
chemistry and physics, the
atomic number (also known as the
proton number) is the number of protons found in the atomic nucleus of an
atom. It is traditionally represented by the symbol
Z. The atomic number uniquely identifies a chemical element. In an atom of electric charge, the number of
electrons also equals the atomic number.
The atomic number is closely related to the mass number, which is the number of protons and
neutrons in the nucleus of an atom. The mass number defines the isotope of the element and often comes after the name of the element, e.g.
carbon-14 (used in
carbon dating).
History
The atomic number originally meant the number of an element's place in the
periodic table.
Dmitri Mendeleev arranged the known elements in increasing order of atomic weight and grouped by their similar chemical properties The Periodic Table of Elements (American Institute of Physics). However, placing the elements in strict order of atomic weight resulted in some mismatches.
Iodine and tellurium, if listed by atomic weight, appeared to be in the wrong order; and would fit better by chemical properties if their places in the table were swapped The Development of the Periodic Table (Chemsoc). Placing them in the order which fit their properties most closely, their number in the table was their atomic number. This number appeared to be related to the mass of the atom but, as the discrepancy showed, reflected some property other than mass.
The anomalies in this sequence were finally explained after research by
Henry Moseley in 1913 Ordering the Elements in the Periodic Table (Chemsoc). Moseley discovered a strict relationship between the x-ray diffraction spectra of elements, and their correct location in the periodic table. This led to the conclusion that the atomic number corresponds to the
electric charge of the nucleus — the charge of the protons. The atomic number is the number of protons that is equal to the number of electrons.
Chemical properties
Each element has a specific set of chemical properties as a consequence of the number of protons in its nucleus. The charge of an atom's nucleus defines its
electron configuration based on principles of quantum mechanics. The form of each element's Electron shell, particularly the valence shell, is the primary factor in determining its chemical bonding behavior.
New elements
The quest for new elements is usually described using atomic number. As of early 2007, elements with atomic numbers through 118 (excluding 117) have been discovered. Synthesis of new elements is accomplished by bombarding target atoms of heavy elements with ions, such that the sum of the atomic numbers of the target and ion elements equals the atomic number of the element being created. In general, the half-life becomes shorter as atomic number increases, though an "
island of stability" may exist for undiscovered isotopes with certain numbers of protons and neutrons.
See also
Notes
Atomic number - Wikipedia, the free encyclopedia
In chemistry and physics, the atomic number (also known as the proton number) is the number of protons found in the nucleus of an atom. It is traditionally represented by the ...
Article about "Atomic number" in the English Wikipedia on 24-Apr-2004
Atomic number The atomic number (Z) is a term used in chemistry and physics to represent the number of protons found in the nucleus of an atom. The atomic number originally meant ...
Atomic number - encyclopedia article - Citizendium
We are creating the world's most trusted encyclopedia and knowledge base. Once you join us and log in, you'll be able to edit this page instantly!
2007 Atomic Weights
See also a copy of the periodic table with atomic weights to five significant figures. See also below the list in Name order. List of Elements in Atomic Number Order.
Chemical Elements.com - Atomic Number
An up-to-date periodic table with detailed but easy to understand information ... Element Groups (Families) Alkali Earth : Alkaline Earth: Transition Metals
Definition: atomic number from Online Medical Dictionary
The Online Medical Dictionary is a searchable dictionary of definitions from medicine, science and technology.
BBC - GCSE Bitesize - Chemistry | Classifying materials | Atomic ...
Make sure you know the difference between these! Atomic number ... Atomic number and mass number. Make sure you know the difference between these!
Atomic Number
Atomic Number In the modern periodic table, the elements are actually arranged in order of increasing atomic number--that's the number of protons in one atom of a particular ...
History of the Periodic Table
Ordering the elements in the Periodic Table (post-16) Henry Moseley finds a property to justify the term atomic number: By 1907, when Mendeleev died, chemists were in little ...
Glossary Item - Atomic Number
A glossary of scientific terms. ... Return to the Glossary Index Page | Atomic Number. The atomic number is equal to the number of protons in an atom's nucleus.
