A particular 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.
bromine (Br)
B.
strontium (Sr)
C.
potassium (K)
D.
krypton (Kr)

Bromine is a chemical element with symbol Br and atomic number 35. It is the third-lightest halogen, and is a fuming red-brown liquid at room temperature that evaporates readily to form a similarly coloured gas. Its properties are thus intermediate between those of chlorine and iodine. ... The colour fades at low temperatures, so that solid bromine at −195 °C

Explanation:

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the answer is d.) potassium