Which ion contains the same total number of electrons as cl-?
a.) s2-
b.)br-
c.)mg2+
d.)na+

Option (A) is the correct answer.

Explanation:

When an atom gains an electron, it attains a negative charge and the number of electrons in that atom increases. Whereas if an atom looses an electron, it attains a positive charge and the number of electrons in that atom decreases.

Atomic number of chlorine is 17 that is there are 17 electrons in a neutral Cl atom. Therefore, in a ion there are 17 + 1 = 18 electrons.

Atomic number of sulfur atom is 16 that is there are 16 electrons in one neutral S atom. Therefore, in a ion there are 16 + 2 = 18 electrons.

Atomic number of bromine is 35 that is there are 35 electrons in a neutral Br atom. Therefore, in a ion there are 35 + 1 = 36 electrons.

Atomic number of magnesium is 12 that is there are 12 electrons in a neutral Mg atom. Therefore, in a ion there are 12 - 2 = 10 electrons.

Atomic number of sodium is 11 that is there are 11 electrons in a neutral Na atom. Therefore, in a ion there are 11 - 1 = 10 electrons.

Thus, we can conclude that and ions contain same total number of electrons.

the potential energy of the reactants is 200j.

from the energy diagram, the energy of the product formed is 350j; this means that, this reaction is an endothermic reaction, because it absorbs energy from its environment.

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