8.5B Exit Ticket

When trying to identify an unknown element, a scientist determines what other elements the unknown element reacts with chemically.
Which property of the unknown element determines the other elements it reacts with?

• The total number of neutrons in the unknown element
• The total number of particles in the nucleus of the unknown element
• The number of protons in the nucleus of the unknown element
• The number of valence electrons in the unknown element

A model of an atom is shown below.
An atom of which element is represented by this model?

• Boron (B)
• Carbon (C)
• Neon (Ne)
• Sodium (Na) 

The table below lists three characteristics of an atom of an element.
An atom of which element is described by the data in the table?

• Radon (Rn)
• Cadmium (Cd)
• Rubidium (Rb)
• Astatine (At)