Answer:
it is iron and flourine gas
Explanation:
Answer: No.
Explanation: Clay is filled with minerals that often weather to create shale. Clay is usually found in muddy environments, so it traps.
Answer:
Helium, this noble gas has the least density at STP
Explanation:
Answer:
About 60.
Explanation:
Mendeleev knew of 63 elements. He wrote their properties on cards and arranged them in order of atomic mass.
That's how he discovered that the properties of elements are periodic functions of their atomic masses.
It provides evidence that each organism is related and similar in each way, leading to the conclusion of a common ancestor.<span />
