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Presentation on theme: "Periodic Trends Vocabulary:"— Presentation transcript:
The elements have trends, too. For example:Look at the zig-zag line on your periodic table. Metals are on the left, nonmetals on the right, and the metalloids are adjacent to the line.
Metalsshinygood conductors of electricity and heathardmalleableductilegive away electronsNonmetalsdullgood insulatorsbrittle
some properties of metals and some of nonmetals
We’re going to look at trends on the periodic table for physical properties of elements. These are:atomic radiuselectronegativityionization energy
Distance from the nucleus of an atom to the outermost electrons.Typically measured as half the distance between the nuclei of identical bonded atoms.The range is about 25 pm for the smallest atoms to about 250 pm for the largest atoms
The ability of an atom in a chemical compound to attract valence electrons. The scale is from 0-4 with 0 meaning no attraction for valence electrons and 4 as the highest attraction.
What do you think would affect the ability of an atom to attract electrons?Number of protons in the nucleus and distance of electron from nucleusWhen an atom gains or loses an electron, the atom is called an ion.
This is a negative ion because it gained an extra negative electron.
The energy required to remove one electron from a neutral atom of an element.What do you think would affect the amount of energy required to remove an electron?Number of protonsDistance from nucleus
This is a positive ion because it lost an electron.
You will now look at trends on the periodic table for atomic radius, electronegativity, or ionization energy.To do this, you will pick one of the following options and use Open Office to make two graphs:Option 1Atomic Radius values of group 1.Atomic Radius values of period 4.Option 2Electronegativity values of group 1.Electronegativity values of period 4.Option 3Ionization energy values of group 1.
Ionization energy values of period 4.
What trend do you see on each graph as you move across a period?What trend do you see on each graph as you move down a family?