Question

W d period?
As the effective nuclear charge acting on the valence shell electrons
increases across a period, the tendency to lose electrons will decrease
Down the group, the effective nuclear charge experienced by valence​

Answer 1

Answer:

ANSWER

Effective nuclear charge is the attractive positive charge of nuclear protons acting on valence electrons. The periodic table tendency for effective nuclear charge:

Increase across a period

Decrease down a group

Hence the reverse trend would be the Atomic mass which decrease down the period and increase down the group