1. explain how do scientists
know what moon's crust is
made of?
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Ответ:
Whent he people went to the moon they told them what it was
Explanation:
Ответ:
"Like the Earth, the Moon has layers. ... Scientists believe that the mantle of the Moon is largely composed of the minerals olivine, orthopyroxene and clinopyroxene. It's also believed to be more iron-rich than the Earth's mantle. The outermost layer of the Moon is called the crust, which extends down to a depth of 50 km."
Explanation:
Ответ:
correct option will D.
Explanation:
Calcium belongs to the group 2 i.e. of alkaline earth metals in periodic table. electronic configuration of calcium is![[Ar]4s^2](/tpl/images/0494/2218/a9fc9.png)
.
So in order to attain noble gas configuration calcium will loose its two electrons during chemical bond formation.
Sulfur is a non metal which forms negatively charged ion so as to complete ts octet during chemical bond formation.
Helium is a noble gas with fully filled electronic configuration.
Carbon forms bond which is covalent in nature.