Which statement is true concerning the reaction n(g) + n(g) → n2(g) + energy?
a bond is broken and energy is absorbed.
a bond is broken and energy is released.
a bond is formed and energy is absorbed.
a bond is formed and energy is released.

A bond is formed and energy is released.

Explanation:

Given a reaction equation, the elements which we have on the left side of the arrow are called the reactants and the elements which we have on the right side are called the products.

In this exercise, the reactants are N(g) and N(g) and the products N2(g) and energy.

After the reaction took place, N(g) and N(g) disappeared and instead N2(g) was formed. We can conclude that a bond was formed between both N(g).

Also, in the products certain amount of energy was released (because we have it on the products side)

The correct option is ''A bond is formed and energy is released''

why do the isotopes of a particular element behave differently in nuclear reactions but the same in chemical reactions? chemical reactions involve changes to electrons in an atom; isotopes do not differ in electrons, and so they react the same way during chemical changes.