Development of the Periodic Table

As of 2012, how many elements are there?

• 100

• 110

• 115

• 118

What did Dmitri invent?

• Children

• Periodic Table

• Russian currency

• Calculator

How are the elements arranged on the periodic table today?

• By atomic mass

• By number of electrons

• By atomic number

• By alphabetic order

Dmitri Mendeleev has an element named after him

• True

• False

Each column in the periodic table is called a 

• period
• group
• cluster
• unit

Elements which are shiny, conduct electricity and heat are called   AND are found to the left of the zig-zag line

• metal
• nonmetal
• metalloid
• nonexistent

The atoms along the staircase are called 

• metals
• nonmetals
• metalloids
• noble gases

Tags

NGSS.HS-PS1-1

These are found to the right of the zig-zag line on the periodic table

• Metals
• Metalloids
• Non-metals

These are the horizontal sections on the periodic table

• period / row
• group / column 

The atomic mass represents a weighted average of all an element's isotopes.  What can you say about Chlorine's isotopes?

• More likely to find Cl-35
• More likely to find Cl-37

Tags

NGSS.MS-PS1-1