INFORMATION:
We have the following options
Ionization energy
Electronegativity
None
Atomic radius
And we must select the options that increase as we move from left to right across a period
STEP BY STEP EXPLANATION:
To select them, we can analyze each option:
- Ionization energy:
In general, ionization energy increases on moving from left to right in a period and decreases on moving down a group.
- Electronegativity:
In general, electronegativity increases on moving from left to right in a period and decreases on moving down a group.
- Atomic radius:
In general, atomic radius decreases on moving from left to right in a period and increases on moving down a group.
Finally, the properties that increase as we move from left to right across a period are Ionization energy and Electronegativity.
ANSWER:
Ionization energy
Electronegativity