The metric system is based on powers of 10 so it is much easier to convert units, often just by moving the decimal point.
Has only 7 electrons so it want to bond with other elements so its very reactive and unstable. Hope this helps
I think the answer is number (4)
It's the rows. They are periods. (1,2,3,4,5,6,7 - the ones without the letters).
Answer:
Do not try to re-light or handle malfunctioning fireworks. Soak both spent and unused fireworks in water for a few hours before discarding.