CH 2 Metalloids, Subatomic Particle Properties, Average Atomic Weights, Periodic Table Groups, Compound Naming Rules

List 6 metalloids

• B, Boron

• Si, Silicon

• Ge, Germanium

• As, Arsenic

• Sb, Antimony

• Te, Tellurium

basic properties (charge, approx. mass...) for protons, neutrons, and electrons.

Subatomic Particle	Symbol	Charge	Mass
Proton	p or p+	+1	1 AMU
Neutron	n or n0	0	1 AMU
Electron	e-	-1	0 AMU

Equation to calculate average atomic weights.

Average Mass =

[Mass isotope #1 x (% abundance /100) ] +

[Mass isotope #2 x (% abundance /100) ]
…(continued for all isotopes)...

where “Alkali Metals,” “Alkaline-Earth Metals,” Transition Metals,”

“Halogens,” and “Noble Gases” are found on the periodic table.

• Group 1: Alkali Metals

• Group 2: Alkaline Earth Metals

• Transition Metals (sunken step into p-table)

• Group 7: Halogens

• Last Group: Noble Gases

Ionic compound naming rules

1. Name the cation first

2. Then name the anion

   • If a single element (i.e. Chlorine) change suffix to -ide

   • If polyatomic simply state name of the polyatomic

3. If metal with variable charge present, include roman numerals

   • ex: Pb4+ is lead(IV).

4. Ionic compounds always based on empirical formula

Covalent compound naming rules

1. Write elements in the order given, changing suffix of last element to “-ide”

2. add appropriate prefixes to each element (mono, di, tri, tetra, penta, hexa, hepta, octa, nona, deca)

3. Name based on molecular, NOT EMPIRICAL formula unlike ionic compounds