How to Get Information from the Period and the Group of an Element – Part 1

The periodic table (PT) aka the periodic table of the elements is an arrangement of the chemical elements into rows (called periods) and columns (called groups) in order of their atomic numbers so that an approximate recurrence of their properties takes place (referred to as periodicity).


From the atomic number Z (= # of protons p = # of electrons e─ for a neutral atom) of an element, the period and the group of an element can be figured out. Likewise, the period and the group of an element can give us valuable information.

Question:

How would you justify the presence of 18 elements in the 5th period of the periodic table?

Solution:



Click/tap to enlarge the image

n = Principal quantum number, l = Azimuthal quantum number

Panic about periodicity❓ Let Chemaficionado know in the comments below or at mychemistryhomework@gmail.com❗

References:

‌‌(1)    Ncert. Chemistry : Textbook for Class XI - Part.I; National Council Of Educational Research And Training: New Delhi.

(2)    Brown, C.; Ford, M. Higher Level Chemistry, 2nd ed.; Pearson Education: Harlow, Essex, 2014.

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