8.5B Protons and Valence Electrons Review

The number on the Periodic Table that indicates the number of protons is the (worth one proton)

• Proton count
• Element number
• Atomic mass
• Atomic number

A chemist was studying a toxic gas and discovered 3 different elements present. Element I has 8 valence electrons, Element 2 has 5 valence electrons, and Element 3 has 7 valence electrons. Which of these elements would be the least reactive? (worth two protons)

• Element 4
• Element 2
• Element 3
• Element 1

An atomic model has 22 protons. What element does it represent? (worth one proton)

• titanium
• copper
• zinc
• iron

What characteristic of an element's atoms always determines the element's chemical reactivity? (worth one proton)

• valence electrons
• number of neutrons
• atomic weight
• The number of protons

Based on this model, would this atom be considered not reactive, slightly reactive or very reactive? (worth two protons)

• very reactive
• not reactive
• moderately reactive
• slightly reactive

What characteristic of an element's atoms always determines the element's identity? (worth one proton)

• number of protons
• number of neutrons
• number of electrons
• atomic mass

An atom has the following characteristics: 38 protons, 50 neutrons and 2 valence electrons. This describes an atom of what element? (worth one proton)

• strontium
• carbon
• oxygen
• sodium

If you change the number of protons in an atom, what changes? (worth two proton)

• The element or its identity changes.

• The number of electrons changes.
• The number of neutrons changes.
• The atomic mass changes.

A model of an atom contains 50 protons, 70 neutrons, and 50 electrons. What element does this model represent? (worth one protons)

• lead (Pb)
• zinc (Zn)
• tin (Sn)
• iron (Fe)

If you were building model of a nitrogen atom, how many protons would you need to include? (worth one proton)

• 5
• 3
• 1
• 7