Reassessment Requirements for Elements Test To view this slide show properly make sure to click “Slide Show” and then “From Beginning”. Go through each slide and CAREFULLY read each slide and THINK about what you are reading. Take notes of the important information on each page.

The Periodic Table of Elements

An element is a substance that is made from one kind of atom only. It cannot be broken down into simpler substances. An element atom

Elements Elements are PURE SUBSANCES made of only one type of atom. So chemists do not have to write out the whole name of an element, they are represented by symbols of one or two letters. *An element symbol only contains one capital letter!

Classifying Elements on the Periodic Table

Metals

Properties of Metals Metals appear to the left of the dark ziz-zag line on the periodic table. Most metals are solid at room temperature. METALS

Properties of Metals Metals have luster. This means they are shiny

Ductile metals can be drawn into wire.

Properties of Metals Malleable metals can be h ammered into sheets

Metals have a high melting point. They are also very dense.

Properties of Metals Conductors Metals are good conductors of electricity and heat

Properties of Metals A chemical property of metal is its reaction with water and oxygen. This results in corrosion and rust.

Nonmetals

Properties of Nonmetals Nonmetals occur to the right of the dark zig-zag on the periodic table. Although Hydrogen is in family 1, it is also a nonmetal. Many nonmetals are gases at room temperature. NONMETALS

Properties of Nonmetals Nonmetals do not have luster; they are dull.

Properties of Nonmetals Brittle Nonmetals are brittle so they break easily. This means nonmetals ARE NOT ductile or malleable.

Nonmetals have low density.

Properties of Nonmetals They also have a low melting point. This is why they are poor conductors of heat and electricity.

Metalloids

Properties of Metalloids Metalloids can be found clustered around the dark zig- zag line that separates metals and nonmetals. METALLOIDS

Properties of Metalloids Metalloids have properties of both metals and nonmetals.

Properties of Metalloids Metalloids are solids that can be shiny or dull.

Properties of Metalloids They conduct electricity and heat better than nonmetals but not as well as metals.

Properties of Metalloids Silicon for example has a shiny metallic luster and is a medium conductor BUT it is brittle and shatters when you hit it with a hammer.

PRACTICE! Read the description of the element and decide if it is a metal, nonmetal, or metalloid by it’s properties. Click to check your answer. Hydrogen – clear, no luster, gas Magnesium – shiny luster, malleable, good conductor Arsenic – shiny luster, brittle Carbon – black, dull luster, brittle Lead – very dense, shiny luster, malleable NONMETAL METAL METALLOID

Elements & Compounds The elements, alone or in combinations, make up our bodies, our world, our sun, and in fact, the entire universe.

Elements & Compounds When elements chemically combine to make different substance it is called a compound. Compounds are made of two or more elements joined. Compound formulas are written by combining the element symbols together.

A compound is a substance that is made from more than one element. atom A compound made up of 2 different elements A compound made up of 7 different elements

A compound can be broken down into the elements that make it up. A compound made up of 3 different elements An element

PRACTICE! On the next slide is a COMPOUND or ELEMENT practice chart. Read the information given in a row and decide whether it is an element or a compound. Click to check your answer.

MaterialMade up of:Element or compound Water Hydrogen and Oxygen Coal Carbon Carbon dioxide Carbon and Oxygen Oxygen Chalk Calcium, Carbon & Oxygen Wax Carbon & Hydrogen Table salt Sodium & Chlorine Helium Compound Element

33 PRACTICE READING COMPOUNDS! Read the compound formula and see if you can figure out HOW MANY ELEMENTS are in it and WHICH ELEMENTS they are. Click to check your answer. NaHCO ₃ NaCl C ₆H₉O₆ 4 – sodium, hydrogen, carbon, oxygen 2 – sodium, chlorine 3 – carbon, hydrogen, oxygen