Question

what has the greatest atomic radius? ar s mg k what has the greatest ionic radius? ar s mg k what has the greatest ionization energy? ar s mg k what has the greatest electronegativity? ar s mg k

Explanation:

1. Atomic Radius: Atomic radius increases down a group and decreases across a period. Potassium (K) is in the fourth - period and first group. Argon (Ar) is a noble gas in the third period, sulfur (S) is in the third period and group 16, and magnesium (Mg) is in the third period and group 2. Since K is in a higher period than the others, it has the largest atomic radius.
2. Ionic Radius: For ions, cations are smaller than their parent atoms and anions are larger. Potassium forms a cation (K⁺), but due to its position in the periodic table, among these elements, K has the largest ionic radius considering its large atomic size before ionization.
3. Ionization Energy: Ionization energy generally increases across a period and decreases down a group. Noble gases have high ionization energies due to their stable electron configurations. Argon (Ar) is a noble gas, so it has the highest ionization energy among these elements.
4. Electronegativity: Electronegativity increases across a period and decreases down a group. Sulfur (S) is more electronegative than Mg and K, and Ar is a noble gas with a stable configuration and low electronegativity. So S has the highest electronegativity among these non - noble gas elements considered for bonding purposes.

Answer:

1. What has the greatest Atomic Radius? K
2. What has the greatest Ionic Radius? K
3. What has the greatest Ionization Energy? Ar
4. What has the greatest Electronegativity? S