Atoms and Elements 04
Some elements are named after countries.

Atoms and Elements 04

This is our final KS3 Science quiz on atoms and elements. A chemical element is a pure chemical substance consisting of one type of atom. Each one has a symbol and a name and can be found on the periodic table. When you first look at a copy of the periodic table, it doesn't seem to follow any pattern - the elements are not placed in alphabetical order. But if you look more closely, you will see that each element has some numbers in the box with its name and symbol. If you look along a row of elements, you will soon notice that the number called the atomic number increases by one from one element to the next. This number tells you how many protons an atom of the element contains.

This pattern took scientists many years to work out. At first, the problem was that they didn't really understand the difference between elements and compounds.

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A French scientist made a list of what he believed to be the elements but was beheaded in the French revolution. Several other scientists tried to make sense of the elements by grouping them together according to their chemical reactions. In the 1860s, a Russian scientist called Mendeleev, put a periodic table together, but left gaps where he thought there were missing elements. He had got it right and the periodic table we know today came from that. The periodic table contains about 118 elements so far, but this may very well increase if we discover more elements.

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  1. Lithium floats on water as it .......
    Lithium is a metal in group 1 of the periodic table, its atoms contain three protons
  2. Which of the following is a halogen?
    The halogens are coloured elements - fluorine (symbol F) is a yellow-green gas
  3. Li, Na, K and Cs are group 1 elements. The most reactive is .......
    The elements in group 1 increase in reactivity as you go down the group. You may have seen a video of this - caesium explodes and destroys the bowl of water
  4. The elements in group 7 of the periodic table are .......
    Group 7 is also referred to in some periodic tables as group 17 and the chemicals of this group are called the halogens
  5. The following elements are named after famous scientists except .......
    Uranium was named after the planet Uranus
  6. The name of the element with the symbol Na is .......
    This is a common symbol that you will come across dozens of times as you study science
  7. The following elements are named after countries except .......
    Fr Francium - France, Po Polonium - Poland, Ge Germanium - Germany. There are several more!! I is the chemical symbol for iodine, a dark purple solid that is a member of the group of elements called the halogens
  8. The name of a gas used in weather balloons is .......
    Both hydrogen and helium are less dense than air. Helium is used in airships as it is unreactive and so safer than hydrogen (check out the Hindenburg disaster). Hydrogen, however, is still used in weather balloons as it is cheaper than helium
  9. A pure substance in which all of the atoms are identical is a description of .......
    Atoms of the same element have the same number of protons in the nucleus as each other
  10. In the periodic table, the elements are arranged in order of increasing .......
    Also called the atomic number, it does in fact tell you how many electrons thare are in an atom

Author: Sue Davison

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