Third period (Atomic number 11 to 18)
This is also a short period it contains
right elements (Sodium to Argon)
Fourth period (Atomic number 1936
This is a long period. It contains eighteen
elements (Potassium te Krypton). This
includes normal elements and 10
transition elements
Finth period (Atomic number 7 to 4)
This is also a long period. It contains
18 elements (Rubidium to Xenon) This
Indledes normal elements and 10
tration elements
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