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Author: admin, 16.10.2014. Category: Small Goals 2016

3.3 As metals and other elements were discovered, scientists recognised that patterns in their physical and chemical properties could be used to organise the elements into a Periodic Table.
Doing this enabled Mendeleyev to correctly predicted the properties of elements not yet discovered. Metals have good conductivity, non-metals have poor conductivity, metalloids have intermediate conductivity.
Ionisation energy: First ionisation energy is the energy required to remove one electron from the neutral atom. From this we can say - metals have high melting points, non-metals have low boiling points. Choose a property that shows clear trends - first ionisation energy, electronegativity, and atomic radius are ideal. From this we can say - metals have high melting points, non-metals have low boiling points.A  Thata€™s because the stronger the forces between the atoms of an element, the higher the melting point.
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Suggest properties of some of the 4 elements you are not familiar with by using the patterns in the periods and groups. This depends on the size of the atom - the smaller the atom, the harder it is to remove one electron. In general, the trend in electronegativity in the periodic table closely mirrors the trends in first ionisation energy. Submit your table and graph showing how the property changes across a period and down a group.
The atomic weight of the middle element is the average of the atomic weights of the other two. As can be seen in the above table, the line occurs to the right of the elements 4, 13, 32, 51 and 84. The nucleus is composed of protons and neutrons, each with about the same mass, although only the protons have positive charge. The elements boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te) and polonium (Po) are known as metalloids.

Electrons have negligible mass but their negative electric charge is equal in size to the charge on a proton, but negative. Some of the allotropes of carbon (C), phosphorus (), tin (Sb), selenium (Se) and bismuth (Bi) also display borderline properties. It follows that the element with the highest first ionisation energy is helium and the element with the lowest is cesium (or francium if you could find some). Which meant I was probably like the normal voter view this would give that in terms of what I saw on Friday night in what I've seen since then.
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