GenChem Exam 1 Memorize

1 in = _____

2.54 cm

1 mL =

1 cm³

C + 273.15 =

Kelvin

density of water

1.0 g/mL

NH₃

Ammonia

H₂S

Hydrogen Sulfide

atomic number

number of protons

alkali metals

a

alkaline earth metals

b

pnictogens

c

chalcogens

d

halogens

e

noble gases

f

transition metals

g

lanthanides

h

actinides

i

empirical formula

smallest ratio of atoms

molecular formula

gives the exact number of different atoms of an element in a molecule

Hydrogen

H

Helium

He

Lithium

Li

Beryllium

Be

Boron

B

Carbon

C

Magnesium

Mg

Sodium

Na

Neon

Ne

Fluorine

F

Oxygen

O

Nitrogen

N

Argon

Ar

Chlorine

Cl

Sulfur

S

Phosphorus

P

Silicon

Si

Aluminum

Al

Potassium

K

Calcium

Ca

Scandium

Sc

Titanium

Ti

Vanadium

V

Chromium

Cr

Manganese

Mn

Iron

Fe

Cobalt

Co

Nickel

Ni

Copper

Cu

Zinc

Zn

Gallium

Ga

Germanium

Ge

Arsenic

As

Selenium

Se

Bromine

Br

Krypton

Kr

Nitrate

NO₃^-

Hydroxide

OH^-

Ammonium

NH₄⁺

Sulfite

SO₃^2-

Sulfate

SO₄^2-

Cyanide

CN^-

Phosphate

PO₄^3-

Carbonate

CO₃^2-

Hydrogen Carbonate (Bicarbonate)

HCO₃^-

Acetate

C₃H₃O₂^- (CH₃COO^-)

Nitrite

NO₂^-

Law of Multiple Proportions

When two elements form more than one compound → the masses for one element in these compounds for a fixed mass of the other element are in small, whole-number ratios. Basically, there are different ratios for the different compounds. 

period

7 horizontal periods

groups

18 vertical groups, similar properties

metal

luster or shine, good conductor of heat and electricity, malleable, ductile (yellow). Typically generous and lose electrons easily

nonmetal

elements that do not exhibit the characteristics of a metal

metalloid

an element that has characteristics of both metals and non-metals