What is 0.639 in scientific notation

Hello!

Order of magnitude of a measure is an estimate of the base power 10 closest to a given measure.

The scientific notation (N) of 0.000000639 (x), being  (number of decimal places) y, knowing that the scientific notation according to the rule of scientific notation, before the comma can only have the numbers 1 to 9, let's see:

note: Moved 7 decimal places to the right negatively

I Hope this helps, greetings ... DexteR! =)

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.

a polar bond is formed when electrons are shared unevenly between atoms