Answer:
The correct answer is Na3N
Explanation:
Sodium nitride (a neutral salt) is composed of an atom of Sodium (Na) and 2 of Nitrogen (N) with the oxidation number +5, requiring 3 electrons to complete its octet.
Combustible: Charcoal, straw, cardboard, paper, candle, wood.
Non-combustible: Chalk, stone, iron rod, copper coin, glass.
Speed and velocity both represent a way to measure the change in position of an object relative to time. In fact, for a straight line motion, the speed and velocity of an object are the same (since distance and displacement will be the same). Speed and velocity are measured in the same units: meters per second or m/s.
Hope this helps!
In my opinion, the answer is the second option.
