Standard Form by Boxed Rockets

Are These Numbers in Standard Form?

5.8 \times 10^{-6}

Yes

3.57 \times 10^{-6}

Yes

6.84 \times 10^{3}

Yes

7.78 \times 10^{-6}

Yes

1.7 \times 10^{3}

Yes

7.8 \times 10^{-4}

Yes