Answer:
Zero or +2
Explanation:
The noble gases already have a avplete outermost shell. They are the least reactive elements of earth?
Their normal oxidation number is zero but some have been shown to be reactive.
Answer:
0º - 23.5º - 45º - 90º
Explanation:
The inclination angle of the Earth's axis with respect to its orbit around the Sun, determines that the duration enters the day and the night is different.
If it is not inclined (angle 0º) the two and niches have the same hardness
If the angle were very high (about 90º) the night would be very long, about half of the orbit period about six months.
Based on this presentation we can answer the question
The Sumo exposition from highest to lowest is
0º - 23.5º - 45º - 90º
Answer:11 km/s
Explanation:
Given
Escape velocity at the surface of earth is 11 km/s
Escape velocity is given by

Escape velocity at the surface of earth
--------------------1
If Escape velocity is three times and the radius is also the three times


i.e. 
Answer:
C:
Explanation:
either C or A but A seems unlikely after multiple attempts. Although the question doesn't make it clear whether the balance is electric either way it could be wrong in someway and seems to be the most likely.