Answer:
a fluorine atom has 9 protons and 9 electrons, so it is electrically neutral. If a fluorine atom gains an electron it will become a fluoride ion with an electric charge of -1
Answer:
714s
Explanation:
t=H/v=500000m/700m/s=714s
For the moon to be visible during the day, it must be up in the sky at the same time as the sun, but not so close to the sun in the sky that you can't see it. The full moon rises at sunset, is up all night, and sets at sunrise, so you can't see a full moon in the daytime.
Answer:
The period of a wave is the time for a particle on a medium to make one complete vibrational cycle. Period, being a time, is measured in units of time such as seconds, hours, days or years. The period of orbit for the Earth around the Sun is approximately 365 days; it takes 365 days for the Earth to complete a cycle.