Why does carbon form covalent bonds instead of ionic?
Couldn't it just gain or lose electrons?
Why are alkanes called paraffins?
What's the story behind the name?
Why does petrol catch fire so easily?
Is it just because it's a liquid?
Why did Mendeleev's periodic table become outdated?
Wasn't it accurate enough?
Why are elements arranged in groups and periods?
What's the advantage of this structure?
Why does metallic character decrease across a period?
Why does sodium behave differently from chlorine?
Why are noble gases unreactive?
Why don't they form compounds easily?
Why does atomic size increase down a group?
What's happening inside the atom?
Why is fluorine more reactive than chlorine?
Both are halogens, but fluorine is “fiercer.” Why?
Why does electronegativity decrease down a group?
Why is oxygen more electronegative than sulfur?
Why are alkali metals highly reactive?
Why do they explode in water?
Why is hydrogen placed separately in the modern periodic table?
Is it a metal, non-metal, or both?
How does the periodic table help predict properties of elements?
Can you guess properties without experiments?
Mole Concept Simplified
What is a mole and why do chemists prefer counting particles in moles instead of individual numbers?
Calculating Moles
How many moles are present in 9 grams of water?
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