The electron-dot symbol for barium is 
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Definitions:
Intron
Intervening sequence found between exons in mRNA; removed by RNA processing before translation.
Exon
Segment of mRNA containing the protein-coding portion of a gene that remains within the mRNA after splicing has occurred.
Adenine
One of the four nucleobase molecules in DNA and RNA, which pairs with thymine in DNA or uracil in RNA and is a fundamental component of genetic coding.
Thymine
A nitrogenous base found in DNA, pairing with adenine through hydrogen bonds.
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