PIA QUÍMICA

What is an element? 

• Ion with a positive charge

• Pure substance that can’t be broken  

• NaHCO

What is an atom?  

How many elements are known on the periodic table?  

• 36

• 118

• 124

• 236

What is a chemical symbol? 

• Are the vertical columns  

• The sum of protons and electrons

• One or two letter abbreviations of the names of the elements 

What is a period on the periodic table?  

• Horizontal rows  

• Vertical Rows

How many periods are on the periodic table?  

• 5

• 18

• 7

• 4

What is a group on the periodic table?  

• Horizontal Rows

• Vertical Rows

How are the groups numbered?  

• 1-30

• 1 to 18, or with letters A and B 

• 1-18 and with letters from a to z

In 1869, this person created the framework that became the modern periodic table, leaving gaps for elements that were yet to be discovered

• Isaac Newton

• Dmitri Mendeleev

• Marie Curie

What are the names of the periodic table's groups?

• Alkali metals, alkaline earth metals, transition elements and non-common names

• Halogens, noble gases and inner transition elements

• Both of the answers