If there are more shells does the nuclear charge decrease

In general, ionization energy increases across a period and decreases down a group. Across a period, effective nuclear charge increases as electron shielding remains constant. ... Down a group, the number of energy levels (n) increase and the distance is greater between the nucleus and highest-energy electron.

Explanation:

Yes, if there are more shells the nuclear charge decreases.

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d.) gravity pulled particles of dust and gas together to form planets.