MediumChemistryHigh School (11–12)The Periodic Table › Development of the Periodic TableThe Periodic Table › Groups and FamiliesConceptual
An element of period 4 has the outer configuration 3d⁵ 4s².
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
An element of period 4 has the outer configuration . Give its block and group, and two properties you expect it to have.
Need a reminder? The key ideaShow
The period is the principal quantum number of the outermost shell. s-block: groups 1 and 2, . p-block: groups 13 to 18, group + outer s and p electrons. d-block: groups 3 to 12, group = d electrons + outer s electrons. f-block: lanthanoids (4f, period 6) and actinoids (5f, period 7).
The worked solution
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Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. Block. The last electron enters the inner subshell: d-block, a transition element.
Step 2. Group. .
Step 3. Properties. It is a metal. Its compounds are likely to be coloured, and it can show several valencies. It is manganese.
Answer: d-block, group 7; a metal with coloured compounds and several valencies.
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