Use the periodic table to answer the question.

An illustration shows the periodic table of elements with elements arranged in increasing order of atomic number in 18 columns (groups) and 7 rows (periods). The electronegativity of elements increases from left to right, across a period. The hydrogen on the left is included in group with medium electronegativity. Also, fluorine is shown as element with highest electronegativity.

Which element is most likely to replace hydrogen in a displacement reaction?

(1 point)
Responses

bromine (Br)
bromine (Br)

helium (He)
helium (He)

lithium (Li)
lithium (Li)

oxygen (O)

1 answer

In a displacement reaction, a more reactive element will replace a less reactive element. Since hydrogen has medium electronegativity, elements that are more reactive than hydrogen will be more likely to replace it.

Among the options provided:

  • Bromine (Br) - this is a halogen and is reactive, but typically reactivity (especially in replacement reactions) tends to decrease going down the group.
  • Helium (He) - as a noble gas, helium is very unreactive and cannot participate in displacement reactions.
  • Lithium (Li) - this is an alkali metal and is very reactive. Alkali metals are known to easily displace hydrogen from compounds.
  • Oxygen (O) - while oxygen is quite reactive, it doesn't usually replace hydrogen in the typical sense of a displacement reaction.

Given these options, the element most likely to replace hydrogen in a displacement reaction is:

lithium (Li).

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