Aparticular element has the following set of properties:
• it has a low melting point.
• it has a low boiling point
• it exists as a two-atom molecule in the gas phase.
it has seven outer electrons.
• it readily reacts with metals to produce a salt.
which element does the list describe?
a.
iodine (1)
b. hydrogen (h)
c. xenon (xe)
d.
barium (ba)

A. Iodine

Explanation:

First 2 points describe it's physical properties. Even if we don't remember them, we can easily figure out the answer to be a non-metal. As, non-metals usually have lower bp and mp than metals.

Both Iodine and hydrogen exists as a 2 atom molecule in gas phase.

But only elements of group 17 (halogens) have 7 electrons in their outer shell.

Again, salts are usually ionic compounds, formed by atoms with a greater difference in their electronegativities. Hence, the one that forms bonds with a metal to form a salt readily can be a non- metal.

All these points indicate that the element must be iodine.

8 m/s because for him to get the same amount of energy as ray is putting out, bobby, who weighs half as much as ray, needs to run twice as fast.

the positions which points up in upward carbon and down in downward carbon are axial

and vice versa holds true for equatorial positions

so the correct answer with labelled diagram will be