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Subtopic 3.1 Periodic Table
1. An element is in period 3 and group 15 of the periodic table. How many electrons are present
in the highest occupied energy level of this element?
A. 3
B. 5
C. 13
D. 15
2. Which is the correct electron configuration for an atom with the atomic number 34 ?
A. Is22s22p63s23p63d10
B. Is22s22p63s23p63d104p6
C. [Ar]4s23d104p4
D. [Ar]3d104p6
3. In Mendeleev’s first periodic table the elements were arranged into seven separate groups.
Explain why modern periodic tables contain the elements arranged into eighteen separate groups.
4. What information about the electron configurations of beryllium, magnesium, and calcium can
be deduced from the fact that all three elements are located in the same group in the periodic
table?
5. Suggest reasons why hydrogen is sometime located:
(a) at the top of group 1 in the periodic table.
(b) at the top of group 7 in the periodic table.
(c) on its own at the top of the periodic table.
(d) together with helium at the top of the periodic table.
6. Use the periodic table to deduce the full electron configuration of:
(a) Selenium (Z = 34)
(b) The vanadium(III) ion, V3+
(c) The zinc(II) ion, Zn2+
(d) The As3- ion
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