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What is the trend in effective nuclear charge for elements on the periodic table?

It decreases across a period but is constant down a group.
It increases across a period but is constant down a group.
It is constant across a period but decreases down a group.
It is constant across a period but increases down a group.

User Johnston
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Answer:

increases across a period but is constant down a group.

Step-by-step explanation:

User Anthony Dugois
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Increase across a period (due to increasing nuclear charge with no accompanying increase in shielding effect).Decrease down a group (although nuclear charge increases down a group, shielding effect more than counters its effect).
User Lockdoc
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