Hydrogen
Where is hydrogen the most abundant element?
The most abundant element in the universe
What group on the periodic table contains the noble gases?
Group VIIIA
A weak but extremely dangerous acid
HF
Where is oxygen the most abundant element?
Most abundant element in earth's crust and human body
the elements that form acid rain
sulfur and nitrogen
Hydrogen gas is most commonly used as
Fuel source
What makes noble gases nonreactive
Full octet
Found in natural state as
Diatomic gases
Two forms of naturally occurring oxygen
Diatomic oxygen O2 and Ozone O3
The three types of compounds formed by hydrogen
Ionic hydrides, metallic hydrides, molecular hydrides
The reason hydrogen is a good fuel source
High bond enthalpy
A primary application for liquid helium
Supercooling
The two elements in group 7 excluded from halogens
Astatine (At) and Tennessine (Ts)
The way we collect oxygen
Distillation from air
Why is iodine usually the center atom of the interhalogens and fluorine is never?
iodine is larger (weaker attachment to its electrons) and fluorine follows octet rule better
The three isotopes of hydrogen
Protium, deuterium, tritium
Which of the noble gases is the most reactive? Why?
Xenon; size (larger size means weaker attraction to its electrons)
Ways to form very strong oxidizing agents
Binary halogens, oxyacids of halogens
Oxygen acts as the ____ in a combustion reaction
Oxidizing agent
Why are the first members of groups 3a, 4a, 5a, and 6a different from other elements in the group?
1. they follow the octet rule most completely
2. they are able to form pi bonds
3. they are the smallest of their columns
The three ways we produce hydrogen for use
Acid + metal, electrolysis of water, methane + steam + catalyst
Give any four examples of compounds formed from noble gases
XeF2, XeF4, XeF6, HArF, KrF2, Na2He
The best oxidizer of the halogens as natural elements
F2
The process used to form ozone
Excitation of O2 by UV rays
the strongest reducing agent
Hydride (H-)