Examlex
Which statement best describes the changes that occur during the fetal period of development?
Noble Gas
A group of chemical elements with similar properties under standard conditions; they are odorless, colorless, monatomic gases with very low chemical reactivity.
Electron Shell
The grouping of electrons surrounding the nucleus of an atom, where electrons exist in fixed energy levels.
Octet Rule
A chemical rule of thumb that states atoms tend to combine in such a way that each atom has eight electrons in its valence shell, giving it the same electronic configuration as a noble gas.
Isoelectronic
Describes atoms, molecules, or ions that have the same number of electrons and similar electronic structure, but different nuclear charges.
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