• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

The Periodic Table

Extracts from this document...


Introduction: Currently, there are 118 known elements. Of these, only 94 are believed to be occurring naturally on our planet. The remaining elements are either radioactive, fabricated as technology advanced or evolved with other elements as time passed by. A chemical element is defined as being pure material in its simplest form, a substance that cannot be broken down or separated any further. Every element has their unique properties that make up what they are. An element can only contain one type of atom, which is the amount of protons within the nucleus, this will always remain the same for the same type of element. ...read more.


If we want to find out the number of neutrons only, then we can find that out by using Mass number - Atomic Number). Elements are sorted into groups and periods. Groups go vertically, whereas periods go horizontally. Elements also have a group number, and the number is equivalent to the number of valence electrons in its outer shell. The number of electrons in its most outer shell will describe an element's chemical properties. All the elements that are put together in the same group will have fairly similar chemical properties due to the fact that they share the same number of valence electrons. ...read more.


They are found in the nucleus of the atom. All electrical protons have a electrical charge of +1. Protons are heavier and larger compared to electrons. Neutrons: Judging by its name, we know that the purpose of neutrons are to neutralise, they don't have any electrical charges, and like protons they are large and heavy. Electrons: Electrons are particles that are extremely small compared to a proton, The mass of an electron is almost 1,000 times smaller than the mass of a proton. Together, all of the electrons of an atom create a negative charge that neutralises the positive charge of the protons located in the nucleus. Electrons are found in clouds and they orbit around very quickly. The higher the atomic number, the more shells and electrons an atom will have. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Classifying Materials section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Here's what a star student thought of this essay

4 star(s)

Response to the question

The student answers the question well with the information given being accurate and relative to the subject. The response is explicit with everything a student at GCSE would need to learn about the periodic table.

Read full review

Response to the question

The student answers the question well with the information given being accurate and relative to the subject. The response is explicit with everything a student at GCSE would need to learn about the periodic table.

Level of analysis

The introduction gives a brief and concise overview, which includes a definition of what an element is which is key to understanding the rest of the essay. This is a transferable skill that you can use anywhere, which is explaining any key words that you use, it shows whoever is marking it that you have an in depth knowledge of the subject. The way the essay has been set out allows for very easy reading, as you do not have to go 'looking' for the points that could be worth marks. The language used for example 'valence electrons' is a high level term that is not commonly used until A-level. Maybe some of the terms used could have been better explained as it would had added to what is already a brilliant essay.

Quality of writing

The fact that key words are in bold type is a very good skill to employ in any subject as it makes marks easy to find. The bibliography at the end of the essay is a good way for teacher/examiners to see where you got your information, to improve this a small evaluation of each source that includes comments on reliability, could be a good idea. Overall this is a very good essay because of the layout and use of key terms.

Did you find this review helpful? Join our team of reviewers and help other students learn

Reviewed by cheekymokeyxxx 30/06/2012

Read less
Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Classifying Materials essays

  1. Marked by a teacher

    Chemistry revision notes. Atomic Structure and Bonding, Electrolysis, Acids and Alkalis.

    5 star(s)

    Reactions which give out energy are called Exothermic. They cause the temperature to rise. Many reactions are exothermic, including all burning (combustion) reactions e.g. 2Mg + O2 = 2MgO Reactions which take in energy are called Endothermic. They may cause the temperature to fall. Thermal decompositions are always endothermic e.g.

  2. Marked by a teacher

    The Periodic Table - Revision Notes The numbers in italics are the page numbers ...

    5 star(s)

    to make an acidic oxide. 68 Eg. Sulphur + Oxygen Sulphur Dioxide S + O2 SO2 All metal elements burn in oxygen to make basic (alkaline ) oxides. Eg Sodium + Oxygen Sodium oxide 4 Na + O2 2 Na2O Groups and Periods 56 A horizontal line going across the periodic table is called a period of elements.

  1. Marked by a teacher

    GCSE Chemistry Revision

    4 star(s)

    The product is the compound sulphur dioxide. Carbon + oxygen Carbon dioxide This is a chemical change because the reactant chemically bond to form the new substance. Methane + oxygen water + carbon dioxide In this process energy is also released, and in a methane molecule there are four hydrogen atoms to every carbon atom.

  2. Marked by a teacher

    Chemistry Revision Notes on atomic structure, nuclear power and the periodic table

    4 star(s)

    > The following shows the simple structure of two atoms, hydrogen and helium. > All atoms consist of an incredibly dense nucleus, surrounded by orbiting electrons which orbit in electron clouds. These electrons have a negative charge. > Within the nucleus are the two subatomic particles, the protons and neutrons.

  1. Marked by a teacher

    In this CDA I will write about how plastic bags are made, why plastic ...

    bag (how much weight the plastic bags were able to hold before it breaks) It is clear from the graph above that the Waitrose carrier bag held the most amount of mass, as on average it held 12.7kg compared to the Somerfield bag which held the least amount of mass on average 11.1kg.

  2. The Period 3 Elements

    Trend in the Boiling Points of the Period 3 Oxides The table below compares the boiling points of some Period 3 oxides with their structure and bonding. Oxide Na2O MgO Al2O3 SiO2 P4O10 SO2 SO3 Boiling point/�C 1275 2827 2017 1607 580 50 33 Structure Giant lattice Giant lattice Giant

  1. investigation of properties of a pair of cis, trans isomers

    Record your observations. 3. Keep the two solutions for further tests( heat the mixture if the solid does not dissolve). Acid strength 4. Compare the acid strength of maleic acid and fumaric acid using clean magnesium ribbons and solid sodium carbonate.

  2. Free essay

    Periodic table

    Hydrogen H 2. Helium He 3. Lithium LI 4. Beryllium Be 5. Boron B 6. Carbon C 7. Nitrogen N 8. Oxygen O 9. Fluorine F 10. Neon Ne 11. Sodium NA 12. Magnesium Mg 13. Aluminium Al 14. Silicon Si 15.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work