Bohr/Lewis Diagrams Practice

What is the name for the central area of an atom, where most of the atom's mass is located?

• Neutron

• Electron

• Proton

• Nucleus

If an element has an atomic number of 23 and an atomic mass of 50.89, how many neutrons must it have in it's nucleus?

• 38

• 28

• 17

• 29

How many electrons does potassium K contain? 

• 19
• 39
• 20
• 40

What are valence electrons?

• electrons in the second orbit/energy level

• electrons in the outermost orbit/energy level

• the atomic number

• electrons in the first orbit/ energy level

How many valence electrons does this element have?

• 2

• 3

• 5

• 10

What element is represented in this Bohr-Rutherford model?

• Carbon

• Hydrogen

• Aluminum

• Lithium

Which element is shown in the Bohr-Rutherford model in the picture?

• Boron

• Carbon

• Nitrogen

• Lithium

Which element is shown in the Bohr-Rutherford model in the picture?

• Lithium

• Boron

• Carbon

• Neon

Which element is shown in the Bohr-Rutherford model in the picture?

• Helium

• Hydrogen

• Argon

• Silver

The "X" in the picture represents an unknown element. Using what you know about Lewis dot diagrams which element could this be the dot diagram of?

• Mg

• Cl

• C

• O