Question

Please helppp :((((

Answer 1

Answer;

X is the effective nuclear charge, and it remains constant down a group.

Explanation;

• Effective nuclear charge is the actual nuclear charge (atomic number) minus the number of inner-core electrons which "shield" the valence electrons from feeling the full attraction.
• Effective nuclear charge increases left to right across a period, because atomic number is increasing while inner-core electrons are constant .
• The effective nuclear charge remains constant down a group, because atomic number increases, but so do the number of core electrons

Answer 2

Answer:

X is the screening constant, and it remains constant down a group.

Explanation:

It makes more sense and the core electrons are known as the shielding electrons, or screening constant. Usually when something is constant it remains consistent/unwavering.