PERIODIC TABLE OF ELEMENTS

Who invented the Periodic Table?

• Mendeleev

• Bohr

• Lewis

• Democritus

As you move left to right on a row or period what happens?

• Atomic number increases by 1

• Electrons decrease

• Number of shells decrease

• Nothing

What happens to the number of shells as you move down a group?

• They decrease by 1

• They increase by 1

• Nothing

The first energy shell can hold ______ electrons.

• 2

• 8

• 18

All elements in the same row have the same number of shells.

• True

• False

• Sometimes

Mendeleev's genius was his ability to

• predict elements that were not discovered yet

• organize elements by their mass

• had an element named after himself

• organize elements by properties

Valence means......

• inside

• outside

• full

Elements in the same group or column have the same ...

• # of valence electrons

• # of shells

• # of protons

• Mass Number

Rows on the periodic table are called ___________.

• Periods

• Sentences

• Fences

Elements in the same group have __________

• Similar Properties

• Same number of shells

• Similar Mass