5. indicate whether the following properties increase or decrease from left to right across the periodic…

5. indicate whether the following properties increase or decrease from left to right across the periodic table.\na. atomic radius (excluding noble gases)\nb. first ionization energy\nc. electronegativity

5. indicate whether the following properties increase or decrease from left to right across the periodic table.\na. atomic radius (excluding noble gases)\nb. first ionization energy\nc. electronegativity

Answer

Answer:

a. Decrease b. Increase c. Increase

Explanation:

Step1: Atomic radius trend

As we move from left - to - right across a period, the number of protons in the nucleus increases while the electrons are added to the same shell. The increased nuclear charge pulls the electrons closer, decreasing the atomic radius.

Step2: First ionization energy trend

From left to right across a period, the effective nuclear charge increases. It becomes more difficult to remove an electron, so the first ionization energy increases.

Step3: Electronegativity trend

As we move from left to right across a period, the effective nuclear charge increases and the atomic radius decreases. Atoms have a greater ability to attract bonding electrons, so electronegativity increases.