Read the speedometer and report the speed to the proper
number of digits in miles per hour (mph) and kilometers per
hour (km/h).
speed: 82mph.
speed: /h

Explanation:

The correct number of digits to report a measure include every certain digit plus one uncertain digit.

The speedometer has marks for:

As a rule you can appreciate up to half way between two small tick marks.

So, for km/h you can appreciate half of 2 km/h, i.e. 1 km/h.

The needle is marking between 120 km/h and 122 km/h, which means that the correct measure is 121 km, where the two leftmost digits are certain and the ones digit is uncertain.

For mph, you can appreciate half of 10 mph, i.e. 5 mph. A measure between 80 and 90 mph should be read as 85 mph.

Furthermore, in this last case of mph, the space between two consecutive marks is broad and equal to 10 mph but also the needle is wide, so it is difficult to appreciate less than 5 mph.

The correct measure must have two significant digits: one certain and one uncertain. So, 82 mph is as correct as 85 mph, since the 8 is certain and the next number (either 2 or 5) is uncertain.

the seeing the electronic configuration we can say that the element is fluorine.

fluorine is the most electronegative element in the periodic table.

but by only seeing the configuration we cannot say about its reactivity because we don't know if its configuration after excitation or by addition of electrons.

but if not then, it is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. as the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.