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An element belongs to IIIA group and forth period in the modern perioidc table what could be the probable atomic number of that element ?

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An element belongs to IIIA group and forth period in the modern perioidc table what could be the probable atomic number of that element ?
A. 23
B. 49
C. 31
D. 13
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Answer:
Elements in IIIA group ar B,AI,Ga,In,TI and in this B belong to the second period
`therefore` The element in IIIA group and fourth period is Ga (gallium) whose atomic number is 31
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