Elements Compounds and Mixtures- History of Elements and Chemical Symbols
Download this file: Yr 8 Elements and Symbols
Part (A) – Elements and the Chemical Symbols (Reading)
WHAT IS AN ELEMENT?
A substance that cannot be broken down into simpler substances by chemical reactions. Atoms of the elements are identical. All atoms of the same element have the same physical properties (size of the atom) and the same chemical properties. Scientists arranged all the elements they knew or they discovered in a periodic table.
SYMBOLS of ELEMENTS:
A chemical symbol (or a chemical formula) is a shorthand method of representing an element. Instead of writing out the name of an element, we represent an element name with one or two letters. The periodic table is a chemist’s easy reference guide.
The symbols used by earlier scientists (Dalton and other scientists in 1808 – 1815) are quite different from symbol that appeared in the periodic table published by Mendeleev 1861, scientists used to obtained the modern periodic table.
Part B: WHAT YOU ALREADY KNOW about the SYMBOLS of elements in a periodic table.
- A capital letter H or a small letter h is used to represent Hydrogen?
- The symbol for chlorine is cl or Cl or CL?
- The symbol for carbon is c or C?
- The symbol for helium is He or HE or he?
- The symbol for calcium is Ca or CA or ca? Why can’t we use C instead?
- The symbol for lead is le or LE or Pb and PB? Why? Explain your answer.
- The symbol for mercury is me or Me or ME or Hg or HG or hg? Why? Explain your answer.
- The symbol for gold is go or Go or GO or Au, or AU? Why? Explain your answer.
- The symbol for silver is si or Si or SI or Ag, or AG? Why? Explain your answer.
- The symbol for iron is ir or Ir or IR or FE , or Fe? Why? Explain your answer.
PART C: INVESTIGATIONS: – Answer all the questions below:
- What is the definition of an element?
- What are chemical symbols and why are they used?
- Use the links below to complete the table below:
- Use the periodic table to find out the symbols of the elements.
- Use the periodic table to find out whether they are metals, non-metals or metalloids.
- Use the periodic table to find out whether the elements are solids, liquids or gases at room temperature.
|Number||Name of element||Chemical Symbol||Solids, liquids or gases at room temperature||Metals, non-metals or metalloids.|
- Name all elements that are metals in the above table?
- Name all elements that are non-metals in the above table?
- Name all elements that are metalloids in the above table?
- True or false?
- Metals can conduct heat and electricity easily. T/F
- Metals are shiny? T/F
- Non-metals can conduct heat and electricity easily. T/F
- Non- metals are dull. T/F
- Non-metals are found on the left of the periodic table? T/F
- Metals are found on the right of the periodic table? T/F
- What is the symbol tungsten (usd to make filament of lamp?
Part E Research. (Group work) and presentation.
Choose an element in the table above (one element per student in the group) and answer the questions below. Prepare a minute presentation per student in the group.
Name of element: _____________________ researched by _____________ (student name.
- What is the chemical symbol of this element? Why is it given this symbol (your reason for this)?
- Who discovered/worked with the element?
- Where and when is this element found naturally?
- Name two uses of this element.