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Elements that have some properties of metals and some properties of nonmetals.
Metalloids are along the zigzag line between the metals and the nonmetals.
They are solids, hard, break easily, and are somewhat reactive.
Metalloids are semiconductors, they move electricity to other objects only at certain temperatures or in certain amounts of light.
Semiconductors are used in computers and lasers.

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Group 14:Carbon
Group 15: Nitrogen and phosphorus.
Group 16: oxygen, sulfur and selenium
Group 17: Halogens-very reactive (except    )
Group 18:noble gases. Do not form compounds with other elements.

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Most are gases.
The physical properties of non-metals are the opposite of the opposite of the physical properties of metals.
Non shiny, break apart easily when hammered, not conductors.
The chemical properties of nonmetals are also the opposite of the chemical properties of metals. Most nonmetals react very easily with the atoms of other elements.

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Elements with atomic numbers higher than 92 are not found naturally on Earth.
These heavier elements were made by scientists in a laboratory by using particle accelerators.

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Reactivity of metals tends to decrease as you move from left to right across the periodic table.
Group 1: Alkali metals- shiny, soft, the most reactive, always combined in nature.
Group 2: Alkaline earth metals-hard, gray-white, and good conductors. Not as reactive as GT1 but more reactive than other metals.
Groups 3 through 12:Transition metals-hard and shiny, good conductors, less reactive.
Only some elements in groups 13 through 15 are metals, not very reactive.

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A metal is a shiny element. Eg:gold
Metals are malleable, they can be hammered or rolled into a flat sheet. (physical property).
Metals are ductile, can be pulled out into a long wire(physical property).
Most metals are good conductors, they have the ability to move electricity or heat to another object. (physical property).
The atoms of some metals, like sodium, are very reactive. Reactivity is the ease and speed an atom has combining with other atoms (chemical property).

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They are also called families.
The elements in each group have properties that are the same. For example, the elements in group 1 are metals that react very quickly with water.

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Elements on the left side of a period are metals that react with other elements very easily.
Elements in the middle of the period do not react with other elements very easily.
Elements at the right end of the table are nonmetals.
The last element in a period is a gas that does not react with other elements.

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One square for each element.
Top number is the atomic number. Atomic number= number of protons in the nucleus.
Chemical symbol is 1 or 2 letters that stand for an element.
Bottom number is the atomic mass. Atomic mass=# of protons + neutrons in the nucleus.

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The periodic table is a chart of the elements. The periodic table shows the repeating pattern of the chemical and physical properties of all elements.

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Dmitri Mendeleev noticed that a pattern of properties appeared when he arranged the element in order of increasing atomic mass.
Some elements had similar physical and chemical properties. When arranged in order of their atomic mass, the properties of these fell into a pattern.

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made up of two or more elements or compounds that are together in the same place. They are not chemically bonded and the properties of each part do not change in the mixture.
A solution is one kind of mixture. The parts are evenly mixed together. Eg: water and sugar.

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made up of the atoms of two or more elements joined together. The joined elements are held together by chemical bonds. A compound has properties different from each element it is made of.

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Element: a kind of matter that cannot be broken down into any other kind of substance. Each element is made up of only one kind of atom. Every element has different physical and chemical properties.

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Mass: is the amount of matter in an object. It does not change in different places. Your body would have the same mass both the moon and Earth.
Mass is measured in Kilograms.
Weight: measures the pull of gravity on an object. Weight changes in different places. You would weigh less on the moon than on Earth.
Volume: is how much space matter takes up. The volume of a liquid is measured in liters and milliliters. The solids' volume is measured in cubic centimeters. 1cm3=1ml
Volume of a solid=length x  width x height
Density: relates the mass of an object to its volume. It can be described as gr/cm3

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is how matter looks, smells, feels, sounds, and tastes.

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Matter is anything around us that has mass and takes up space.