Answer: the answer would be D
Explanation:In passive solar building design, windows, walls, and floors are made to collect, store, reflect, and distribute solar energy in the form of heat in the winter and reject solar heat in the summer. an example of this would be a green house in the winter the sun is still out but the windows keep out the cold air so the sun just heats up the air inside
Be 1s²2s², [He]2s²
beryllium (2- second period, s² - 2A group)
3 sf
<span>(Rules:
> Non-zero digits are always significant.
123 - 3sf
> Any zeros between two significant digits are significant.
102 - 3 sf
<span>> A final zero or trailing zeros in the decimal portion ONLY are significant.
4500 - 2 sf
0.04 - 1 sf
0.0013 - 2 sf )
</span></span>
