Unit 4: The Periodic Table

The first person to  first to arrange elements by their

                                properties in an organized way.

• Dalton

• Mendeleev

• Moseley

• Bohr

Tags

NGSS.HS-PS1-1

Organized the periodic table by atomic mass.

• Dalton

• Mendeleev

• Moseley

• Bohr

Organized the periodic table by atomic number

• Dalton

• Mendeleev

• Moseley

• Bohr

Go across the periodic table

• Period

• Group

• Family

• Row

Go down the periodic table

• Period

• Group

• Family

• Row

Properties of elements are similar

• Period

• Group

• Family

• Row

Properties of elements change

• Period

• Group

• Family

• Row

How do you find the valence electrons?

• By looking at the period #

• By looking at the column #

• By looking at the atomic number

• By looking at the atomic mass

How many valence electrons would an atom of Barium have?

• 1

• 2

• 5

• 7

The outermost electrons in an atom

• Valence electron

• Ion

• Cation

• Anion