• 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)

    This requires energy so the forward reaction is endothermic When water is added to anhydrous copper sulphate, it turns blue and heat is given out so the reverse reaction is exothermic. This reaction is sometimes used as a test for water.

  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 ...

    I then recorded the mass each bag took into a results table. Tesco 1 Tesco 2 Tesco 3 Somerfield 1 Somerfield 2 Somerfield 3 Waitrose 1 Waitrose 2 Waitrose 3 13.5kg 13.2kg 7.8kg 10.7kg 11.6kg 11.0kg 12.7kg 12.8kg 12.6kg The results table above shows the repetition of my experiment and the results.

  2. Free essay

    Periodic table

    Positively charged and cannot travel through materials easily. E.g. human skin and paper. Little hazard Beta: beta particles are the same size and mass as electrons. They can have a positive or negative charge. Can penetrate human skin and damage cells.

  1. Classify and identify different polymers to determine their physical properties and uses.

    Put each polymer in the water separately. 3. Record the data (ie. whether it floats or sinks). 4. From the results collected, work out the densities. Experiment 3 - Acid Resistance Test: 1. Place each polymer on the heatproof mat.

  2. Chemistry Coursework. Aim: To find out if the thickness of plastic bags is ...

    This ensures that the experiment is reliable because it is repeatable. Deviating from the method for any part of it could vary the results to those which should be found. * Use the same area of bag, 3cm x 20cm.

  1. Gold. For thousands of years, gold has been regarded as the finest and ...

    subcontinent 24 99.70 997.0 Minimum allowed for fine gold 24 99.95 999.5 Minimum allowed for proof gold There are several ways in which to test a material of its gold content. Some are destructive (i.e. after the test the material has been damaged in some way, therefore; losing its original value)

  2. Our experiment consisted of two samples of water containing unknown substances, and our objective ...

    To find out the concentration in grams per cubic decimetre use the formula 17. To ensure validity, do everything (like heating the liquid for the same amount of time) as you did for the first sample otherwise the results may not be accurate, and accuracy is important for valid results.

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