D.
A more accurate answer would be -50 m/s. 50 m/s is the change in speed.
We know that 
, where 
is density, 
is mass, and 
is volume.
Substitute in the values we know and solve:
Answer:
A. Atoms gain, lose, or share electrons to achieve a full valence shell
Explanation:
The octet rule is best explained as the process in which atoms lose or gain or share electrons to achieve a full valence shell.
- In this process bonds are formed when there is an attraction between the two substances.
- For electrovalent compounds, an atom will lose electrons or gain electron to form an ion, the electrostatic attraction causes the bond formation.
- Covalent compounds, form by sharing of electrons.
Therefore, the octet rule is attained when atoms gain full valence configuration.
Answer:
B. it is a community of plants,animals and there physical surrounding.
