Page 15 - eBook T2 eISBN2
P. 15
MANUAL TITLE GOES HERE
Example 2: Potassium with atomic number is 19.
n = 1 ---------> 2(1) = 2 --------> 1 . shell carries 2 electrons.
st
2
n = 2 ---------> 2(2) = 8 --------> 2 . shell carries 8 electrons.
2
nd
Potassium atomic number is 19, first shell carries 2 electrons. Second shell carries 8 electrons.
rd
There is 9 remain electrons. The 3 . shell will carry 8 electrons and 1 last electron will carry
in the outer shell. Figure 2.4: shows electrons configured in Potassium.
Figure 2.4: Number of electrons in every shell Potassium atom
By using this formula, the number of electrons in every shell can be determined easily, shows
in Table 2.3. But this method actually identified as cannot satisfy to configure electrons in
each shell for every element on periodic table. Thus, Aufbau principle used.
PAGE 14 OF 42
Copyright © 2022 – Politeknik Kota Bharu
