From what class(es) of elements is the following compound made? nitrogen dioxide
metal and metalloid
two metals
metal and nonmetal
two nonmetals

Nitrogen dioxide is a compound made of two nonmetals.

Explanation:

Nitrogen dioxide is made by 1 nitrogen atom and two oxygen atoms. Nitrogen and oxygen are both gases. That being close to being metalloids they aren't because they can't change their structure as metalloids do. Their covalent bonds are also weaker to be considered metalloids.

for step 7 table c on the lab "newtons law of action"   the average time it took the car to travel .25 meters   was 1.92 seconds.

the average time it took the car to travel 0.50 meters was 2.61 seconds

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1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.