The exponential form of one billion is 1*10^9.
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1011
5.0 × 109
1.0 × 109
"Billion" usually has the meaning "thousand million". So 7 billion = 7 x 109.Traditional UK usage has billion meaning "million million". This in exponential form (scientific notation) is 7 x 1012.
1000000EDIT: The exponential form (which is what was asked for) is 106