241Which element has the atomic number 8?
242Which element has the atomic number 26?
243Which element has the atomic number 79?
244Which naturally occurring element has the atomic number 92 and is used as nuclear fuel?
245Which scientist is widely credited as the main developer of an early version of the periodic table arranged by atomic mass?
246The modern periodic law, arranging elements by atomic number rather than atomic mass, is credited largely to which scientist?
247Elements placed in the same group of the periodic table generally share the same number of what?
248Valence electrons are the electrons found in which part of an atom?
249On the standard periodic table, metals are generally located mostly on which side?
250On the standard periodic table, nonmetals are generally located mostly on which side?
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