100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
Previously searched by you
Previously searched by you
logo
Summary Unit 1 Topic 1 - The Atom £5.49   Add to cart
Quickly navigate to
Preview
  2.  
  3. PEARSON (PEARSON)
  4.  
  5. Chemistry 2015
  6.  
  7. Unit 1 - Atomic Structure and the Periodic Table

Summary

Summary Unit 1 Topic 1 - The Atom
 6 views  0 purchase

Study notes for Unit 1 Topic 1 - The Atom for Chemistry Edexcel A Level 2015. Focusing on particles, isotopes, relative atomic/isotopic/molecular mass and mass spectrometry,

Preview 1 out of 3  pages

Document information

  • December 1, 2022
  • 3
  • 2020/2021
  • Summary

Subjects

Written for

All documents for this subject (36)

Seller

avatar-seller
einavd-l

Content preview

Chemistry Notes Topic 1.1 - The Atom

Subatomic particles:
Subatomic Particles Relative Mass Relative Charge Located in

Proton 1 +1 Nucleus

Neutron 2 0 Nucleus

Electron 0.0005 -1 Orbitals


Nuclear symbols:
● Mass number = total amount of protons and neutrons.
● Atomic number = identifies the element.
● In neutral atoms with no charge = the number of electrons is the
same as the number of protons.
● Ions have different numbers of protons and electrons.
● Negative ions have more electrons and positive ions have more
protons.

Isotopes:
● Isotopes = atoms of the same element with different numbers of neutrons.
● E.g. Chlorine-35 and Chlorine-37.
● The atomic number is the same.
● Because isotopes have the same configuration of electrons they have the same
chemical properties.
● They do have slightly different physical properties which depend on the mass of an
atom.

Relative atomic mass, Ar:
● This is the weighted average mass of an atom of an element compared to 1/12th
of the mass of an atom of carbon-12.
● Usually not a whole number.
● E.g. relative atomic mass of chlorine = 35.5

Relative isotopic mass:
● This is the mass of an atom of an isotope compared to 1/12th of the mass of an
atom of carbon-12.
● Usually a whole number.
● E.g. relative isotopic masses of chlorine = 35 and 37

Relative molecular/formula mass, Mr:
● This is the average mass of a molecule or formula unit compared to 1/12th of the
mass of an atom of carbon-12.
● Adding up all the relative atomic masses gives Mr.
● Relative molecular mass = used with simple molecules.
● Relative formula mass = used for ionic or giant covalent compounds

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

Guaranteed quality through customer reviews

Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.

Quick and easy check-out

Quick and easy check-out

You can quickly pay through credit card for the summaries. There is no membership needed.

Focus on what matters

Focus on what matters

Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!

Frequently asked questions

What do I get when I buy this document?

You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.

Satisfaction guarantee: how does it work?

Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.

Who am I buying these notes from?

Stuvia is a marketplace, so you are not buying this document from us, but from seller einavd-l. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for £5.49. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

61325 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy revision notes and other study material for 14 years now

Start selling
£5.49
  • (0)
  Add to cart