Metals Elements Periodic Table of Elements. Matter: Properties and Changes

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1 Metals Elements Periodic Table of Elements Matter: Properties and Changes

2 Warm up Using each letters from yesterday activity My Name as an Element, you will write the following: - name of element - chemical symbol - atomic number - atomic mass - period number - group number Example: Oxygen, O, 8, 15.99, period 2, group 16

3 Lesson Objectives What are the physical properties of metals? How does the reactivity of metals change across the periodic table? How are elements that follow uranium in the periodic table produced?

4

5 Metals Most of the elements in the periodic table are metals. Chemists classify an element as a metal based on its physical properties like: hard shiny smooth

6 Physical Properties of Metals The physical properties of metals included shininess, malleability, ductility, and conductivity. 1. A malleable material can be hammered or rolled into flat sheets and other shapes. 2. A ductile material can be pulled out, or drawn, into a long wire. 3. Conductivity is the ability of an object to transfer heat or electricity to another object. Many metals are good conductors. Several metals are also magnetic. They are attracted to magnets and can be made into magnets. Most metals are solids at room temperatures.

7 Physical Properties of Metals magnetism malleability ductility conductivity

8 Chemical Properties of Metals The ease and speed with which an element combines with other elements and compound is called the reactivity. Metals usually react by losing electrons to other atoms. Some metals react with oxygen in the air, forming metals oxides, or rust. This process called corrosion.

9 Metals in the Periodic Table The metals in a group, or family, have similar properties. Family properties change gradually as you move across the table. The reactivity of metals tend to decrease as you move from left to right across the periodic table.

10 Alkali Metals Group 1 metals Alkali metals are so reactive they are never found uncombined in nature. They are found only in compounds. They react with other elements by losing one electron. As pure, uncombined elements, some of the alkali metals are shiny and so soft that you can cut them with a plastic knife. Most important are Sodium and Potassium Hydrogen is a special elements. No include in the alkali metal.

11 Alkaline Earth Metals Group 2 metals Not reactive as the alkali metals. They are also reactive that they cannot be found uncombined in nature. Most common: Magnesium and Calcium

12 Transition Metals Metals in Group 3-12 They form a bridge between the very reactive metals on the left and the less reactive metals and other elements on the right. Are less reactive Most are hard and shiny Are good conductors of electricity

13 Metals in Mixed Group Group 13 through 15 of the periodic table include metals, nonmetals, and metalloids. Metals are not nearly as reactive as those on the left side of the table. Aluminium, tin, and lead

14 Lanthanides and Actinides Lanthanides Lanthanides are mixed with more common metals to make alloys. Many of them are usually found together in nature. They are difficult to separate from one another because they all share very similar properties. An alloys is a mixture of metals. Actinides Many of the actinides are synthetic elements. All the elements heavier than uranium are created artificially in laboratory. The nuclei of this elements are unstable, meaning that they break apart quickly into smaller nuclei.

15 Lanthanides and Actinides

16 Synthetic Elements Elements above uranium are made - or synthetic - when nuclear particles are forced to crash into one another. Some synthetic elements are made in nuclear reactors. The difficulty of synthesizing new elements increase with the atomic number. Powerful machine called particle accelerators make synthetic elements with atomic numbers above 95.

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