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Write the complete symbol of: a. The nucleus with atomic number `56` and mass number `138` The nucleus with atomic number `26` and mass number `55` c.

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Write the complete symbol of:
a. The nucleus with atomic number `56` and mass number `138`
The nucleus with atomic number `26` and mass number `55`
c. The nuleus with atomic number `4` and mass number `9`
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a.`._(56)X^(138) or _(56)Ba^(138)` b.`._(26)X^(55) or _(26)Fe^(53)` c.`._(4)X^(6) or _(4)Be^(8)`
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