Name: _________________________________________________
Homework 5: Protons, Neutrons, and electrons for ions,
The periodic table, and nomenclature
1.) Fill in the table below – make sure to fill in all blank spaces!!: make sure that you list the
numbers of protons, neutrons, and electrons for each species and the charge if needed:
24Mg+2
23Na+1
70Ga--0--
12 protons
___11___ protons
__31____ protons
__10____ electrons
10(!!) electrons
__31___ electrons
___12___ neutrons
___12___ neutrons
39 neutrons
35Cl0---
39K
56Fe+3---
17 protons
___19___ protons
__26____ protons
___17___ electrons
__19___ electrons
23 electrons
___18___ neutrons
20 neutrons
___30___ neutrons
32S--0--
48Ti--+2--
59Co+3---
___16___ protons
___22___ protons
___27___ protons
__16___ electrons
20 electrons
24 electrons
__16____ neutrons
___26___ neutrons
___32___ neutrons
2.) Label the following elements as metals, nonmetals or metalloids.
a) Germanium (Ge) _________metalloid______________
b) Manganese (Mn) ____________metal____________
c) Cesium (Cs) ________metal__________________
d) Krypton (Kr)____________non-metal_______________
3.) Give the name and symbol for a unique element (use each only once) that (you may need your
text, periodic table or internet for this question!):
a) Is found in the s-block ___________any element in group 1A_________________
b) Is found in the d-block __________any element in the center block – e.g. Cu, Zn___________
c) In found in the actinides ___________Any element in the very last row (Th-Lr)_________
d) Is a halogen _________F-At in column 7A__________________
e) Is a noble gas ____________He-Rn in column 8A_______________
f) Is found in the p-block ________any element in the far right “block” – e.g. N, F, Cl___________
4.) Name the following ionic compounds.
MgCl2 ____magnesium chloride_________________
SrO ____strontium oxide______________________
Al2S3 ____aluminum sulfide___________________
ZnO _____zinc oxide_______________________
NaBr ____sodium bromide_________________
5.) Name the following covalent compounds:
a. CO ___carbon monoxide_________________
b. NO ____nitrogen monoxide___________________
c. NO2 ___nitrogen dioxide________________
d. SO2 ____sulfur dioxide______________
e. PCl5 ____phosphorus pentachloride___________
f.
PCl3 ___phosphorus trichloride__________
6.) Give formulas for the following molecular compounds: (don’t overthink it!!)
bromine pentafluoride ___BrF5_______________
dinitrogen tetraoxide _____N2O4_______
iodine monobromide _____IBr_____