Answer:
what are u asking there isnt a question
By definition, we have that the number of neutrons is given by:
# neutrons = atomic mass - # protons
We know that the atomic mass is equal to 84.
We know the atomic number of Krypton is equal to 36. This means that the Krypton has 36 protons and 36 electrons.
Therefore, substituting values we have:
# neutrons = 84 - 36
# neutrons = 48
Answer:
The Krypton has 48 neutrons
Answer: be found in group 17 and be highly reactive
Explanation:
Elements are distributed in groups and periods in a periodic table.
Elements that belong to same groups will show similar chemical properties because they have same number of valence electrons.
Flourine, chlorine, bromine and iodine are elements which belong to Group 17. All of them contain 7 valence electrons each and need one electron to complete their octet.
The chemical reactivity of elements is governed by the valence electrons present in the element and thus all of them are highly reactive.
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