6th Grade Life Science Miss Sauer PERIODIC TABLE OF ELEMENTS 6th Grade Life Science Miss Sauer

ELEMENTS Element: is a substance that cannot be broken down into other substances.

ATOMS Atom: basic building block of matter. An atom is the smallest unit of an element. All atoms of an element contain the same number of protons.

ATOMIC NUMBER Atomic Number: The number of protons in an atom.

Classification of the Periodic Table: Scientists classify elements based on their properties. Three Basic Kinds of Elements found on the Periodic Table: Metals are good conductors of electricity, shiny, and heat well. Non-metals are poor conductors of heat and electricity, dull luster. Semi-metals have properties between metals and non-metals (heat better than non-metals, but poorer than metals).

Classification of the Periodic Table: Scientists also classify elements according to their state of matter (gas, solid, liquid). The majority of the elements on the Periodic Table are solids (only 2 are liquids & 11 are gases).

Broken up by Solids, Liquids, & Gases Br (Bromine) & Hg (Mercury) are the only Liquid Elements at room temperature.

Broken up by Metals, Non-Metals, & Semi-Metals (Metalloids):

What is the PERIODIC TABLE? Shows all known elements in the universe. Organizes the elements by chemical properties.

How do you read the PERIODIC TABLE?

What is the ATOMIC NUMBER? The number of protons found in the nucleus of an atom Or The number of electrons surrounding the nucleus of an atom.

What is the SYMBOL? An abbreviation of the element name.

What is the ATOMIC WEIGHT? The number of protons and neutrons in the nucleus of an atom.

I made the PERIODIC TABLE ! I am Dmitri Mendeleev! I made the PERIODIC TABLE !

Dmitri Mendeleev Dmitri Mendeleev arranged the elements according to their mass in 1869. This was the first Periodic Table. The advantage of this table was it showed relationships across rows and columns of elements. Mendeleev was able to predict the existence and properties of elements that hadn’t yet been discovered. The Periodic Table was an important step in understanding elements’ properties.

Why Use the Periodic Table? The Periodic Table allows you to compare the elements and understand their properties.

TODAY’s PERIODIC TABLE: Today’s Periodic Table is arranged according to their atomic number. As you move across each row, from left to right, the atomic number increases. As does the atomic mass.

ATOMIC NUMBER: The atomic number is equal to the number of protons found in the nucleus. The more protons in the nucleus, the more the atomic mass will increase.

ATOMIC NUMBER Atomic Number: The number of protons in an atom.

ELEMENTS: Elements are arranged in columns or groups. Elements in any one group have similar chemical properties.

COMPOUNDS A compound is made up of two or more elements that are chemically combined.

What is an ELEMENT? A substance composed of a single kind of atom. Cannot be broken down into another substance by chemical or physical means.

What is a COMPOUND? A substance in which two or more different elements are CHEMICALLY bonded together.

What’s the difference between a Group & a Row? Groups: go up and down on the Periodic Table Rows: go across

What do you notice about the Atomic Number & Atomic Mass as you move across each ROW? They both increase. Why? The atomic number is equal to the number of protons found in the nucleus. The more protons in the nucleus, the more atomic mass will increase.

Protons are Important! Different arrangements of protons may result in different forms of an element.

Closure Questions The Periodic Table is broken up in which 3 groups? (two answers) Elements in a group have what kind of chemical properties? Mendeleev arranged the Periodic Table by? Today’s Periodic Table is arranged by? Know how to read the Periodic Table. Be able to give the atomic mass, atomic number, symbol for a given element. Given a symbol, be able to give the name of the element.