Your answer is...
<em>B) Electrons in valence shells are shared between nuclei.</em>
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Explanation:
The simple definition of a covalent bond is a strong force when two atoms share one or more pairs of electrons.
Popular examples of covalent bonds would be:
Carbon Monoxide (CO)
Methane (
)
Water (
)
Answer:
A balance
Explanation:
Scientists measure mass with a balance, such as a triple beam balance or electronic balance. In science, the volume of a liquid might be measured with a graduated cylinder.
Answer:
Time period, T = 403.78 years
Explanation:
It is given that,
Orbital distance, 
Mass of the Earth, 
Mass of the planet, 
Let T is the orbital period of this planet. The Kepler's third law of motion gives the relation between the orbital period and the orbital distance.



or
T = 403.78 years
So, the orbital period of this planet is 404 years. Hence, this is the required solution.
Explanation:
We need to find the speed of a 3.1eV proton and a 3.1eV electron.
For proton, using conservation of energy such that,

is mass of proton

For electron,

is mass of proton

Hence, this is the required solution.