MediumChemistryHigh School (11–12)The Periodic Table › Development of the Periodic TableNumericalBoard Exam
Period 6 begins with the filling of the 6s subshell…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Period 6 begins with the filling of the subshell. List the subshells that fill in period 6, in order, and find how many elements the period holds. How many of them are lanthanoids?
Need a reminder? The key ideaShow
Moseley found that of the X-rays of an element is a straight-line function of its atomic number : . The modern periodic law: properties are a periodic function of . Temporary IUPAC names join the roots nil, un, bi, tri, quad, pent, hex, sept, oct and enn for the digits of and add ium.
The worked solution
Have you tried it?
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. The subshells. , then , then , then .
Step 2. Count. elements.
Step 3. The lanthanoids. The 14 elements filling are the lanthanoids.
Answer: elements, of which are lanthanoids.
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