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 Mass14__ Isotope Name:NitrogenSymbol_N_	Atomic # ____ Atomic Mass_12_ Element:_____________ SymbolC_	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_____

Atomic Structure practice

The purpose of this assignment is to help you become more familiar with the atomic structure of some common elements by completing the chart below. For each element you have been given enough information to fill all of the blanks.

Isotopic Name	Isotopic Symbol	Atomic #	Mass #	# Protons	# neutrons	# electrons	# Valence elec.
		2	4
		12			12
		30	65
	Br		80			35
Aluminum-27				13	14
	U				146	92
		11			12
Krypton-84					48	36
	Ca		40	20
	Ag			47	61