2. Which of the following is the reason that ionization energy generally increases from left to right across the first period of
the periodic table?
(A) As the atomic number increases, the electrons are harder
to remove.
(B) Ionization energy increases as the atomic number
increases in a period.
(C) As the atomic number increases, more electrons are
added to the atoms, thus increasing the electron-electron
repulsions.
(D) As the atomic number increases, more protons in the
nucleus cause an increase in the effective nuclear charge,
making it harder to remove the electrons.

yes they ca   is ur ansswerrr

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.

the answer is c

tell me if wrong