5.1 Intro to Periodic Table

In 1750, how many elements had been discovered? **just the number!

• 17
• 57

• 43

• Skibidi Ohio Rizz

According to the text, who was the first scientist to group elements into categories?

• John Newlands
• Dimitri Mendeleev
• Antoine Lavoisier

How many elements were on Mendeleev's first periodic table? Just the number!

• 63
• Are you serious right now?

• 45

• 9

What inspired Mendeleev's approach to organinzing the periodic table?

• His chemistry students
• A deck of cards
• The element's names
• Previous organization methods

Mendeleev's periodic table is arranged by .....?

• Increasing atomic number
• Increasing atomic mass
• Decreasing atomic number
• Decreasing atomic mass

Why was Mendeleev's table incomplete?

• He didn't have access to all the elements
• The elements didn't exist
• The elements had not been discovered
• He couldn't read

Why did Mendeleev put Bromine and Chlorine in the same group?

• Because they have similar properties
• Because they have the same number of neutrons
• Because they have the same number of energy levels
• Because they ryhme

How did Mendeleev decide to place the gaps in his table?

• Based on the total number of elements
• Based on the available spaces
• Based on the properties of the elements
• Based on his wife's suggestions

Mendeleev's table was developed before what discovery?

• The existence of atoms
• The existence of protons
• The existence of matter
• The existence of atomic mass

The modern periodic table is arranged by .....?

• Increasing atomic number
• Increasing atomic mass
• Decreasing atomic number
• Decreasing atomic mass