Bohr Model Practice Problems
Name:______________________
Period:____
In 1943, Niels Bohr described the atom as a planetary system with electrons orbiting around the nucleus. Bohr’s
model is incomplete, but it nonetheless is helpful in understanding why some atoms are very reactive and others
are less so.
Directions: complete each of the following models using what you know about atoms. The first is completed for
you as an example.
Atomic # 7__
Atomic Mass 14__
Isotope Name: Nitrogen
Symbol_ N_
Atomic # ____
Atomic Mass_12_
Element:_____________
Symbol C_
Atomic # ____
Atomic Mass_40_
Element:_____________
Symbol_____
Atomic # ____
Atomic Mass____
Element:_____________
Symbol _H_
Atomic # ____
Atomic Mass_40_
Element:_____________
Symbol_____
Atomic # ____
Atomic Mass_11_
Element:_____________
Symbol _B_
Atomic # ____
Atomic Mass_27_
Element:_____________
Symbol_____
Atomic # ____
Atomic Mass_32_
Element:_____________
Symbol_____
Atomic # ____
Atomic Mass_37_
Element:_____________
Symbol_____
Atomic # ____
Atomic Mass_23_
Element: Sodium
Symbol_____
Atomic # _10_
Atomic Mass_20_
Element:_____________
Symbol_____
Atomic # ____
Atomic Mass____
Element:_____________
Symbol_____
