The answer to your question is D.
Answer:
Elements in group IIA have 2 electrons in their outermost shell so they can donate these electrons of group VII A which have seven electrons in their outermost shell. So it is necessary 2 elements of group VII A, each atoms accepts one electron.
Explanation:
Sustainable product design is not an example of environmental sustainability.
<u>Explanation: </u>
- Development which meets the present needs without compromising the ability of future generations to meet their own needs is known as sustainable development.
- For the process of waste management, many lands deposited should be cleaned and preserved properly. Throwing waste in public places or plastics which is not biodegradable can affect the environment as well as living things. Proper disposal of waste should be done and many landfill processes are made for the safety of a clean environment.
- Energy optimization is a major key to environmental sustainability. Much renewable energy is practiced to improve the optimization of energy. Resource management is not only environment-related it also helps in improving the ethical, economic and scientific variables.
Answer:
Explanation:
<u>Displacement Vector</u>
The displacement, as every vector, has a magnitude r and a direction angle θ measured from the positive x-axis.
If we know the x-y components of the displacement, the magnitude and angle can be calculated by the equations:
The coordinates of the given vector are x=-12 m, y=21 m, thus:
Since the vector lies in the second quadrant, we add 180° to find the correct direction:
