What is the definition of isotopes?

What is the total number of electrons an atom with principal quantum shell 9 can occupy?

HWhat is the relationship between the principal quantum number and ionisation energy?

When electrons are added successively to a set of orbitals of the same energy, they occupy them singly first before any pairing occurs. What is this rule/principal named?

What does the number of valence electrons determine?

What is the order of bond strength from strongest to weakest?

Why are metals a good electrical and heat conductor respectively?

What is an allotrope? What is an example of an allotrope of carbon?

How many bond pairs and lone pairs does a molecule with a trigonal-bipyramidal shape have?

Which is the only atom that hydrogen cannot bond with via hydrogen bonding?

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