The energy required to remove two valency electrons of a metallic atom is called? a. second ionization energy b. ionization energy. c. electron affinity. d. activation energy

Option (a) is the correct answer.

Explanation:

Amount of energy needed to remove an electron from a neutral or gaseous atom is known as ionization energy.

The energy required to remove one valence electron from a neutral or gaseous atom is called first ionization energy whereas when two valence electrons are removed then it is called second ionization energy.

Thus, we can conclude that the energy required to remove two valency electrons of a metallic atom is called second ionization energy.

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.

since electrons are negative the answer is neagtaive