How many significant figures does 0.00130 have

3 significant figures

Explanation:

I underlined the significant figures in this number:

0 . 0 0 1 3 0

explanation:

detials on each model with digrams

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.