3. Which of these statements is an accurate description of the ionization energies of elements in the periodic table? F. The ionization energy of lithium is greater than that of potassium.
G. The ionization energy of iodine is greater than that of fluorine.
H. The ionization energy of magnesium is greater than that of sulfur.
J. The ionization energy of krypton is greater than that of neon.

The accurate description of the ionization energies of elements in the periodic table is; the ionization energy of lithium is greater than that of potassium.

In the periodic table, ionization energy decreases down the group and increases across the period. So, as we move from left to right in the table, it takes more energy to remove an electron from the atom.

Lithium and potassium are members of group 1, Lithium is far higher than potassium. It takes more energy to remove an electron from lithium than for potassium.

Hence, the ionization energy of lithium is greater than that of potassium.

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option A is correct

Explanation:

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e