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25 February, 23:26

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.

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  1. 26 February, 00:38
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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).
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