i. Sodium chloride is formed between sodium and chlorine.
ii. Sodium (11Na23) configuration is 1s22s22p63s1
iii. Chlorine (17Cl35) configuration is 1s22s22p63s23p5
iv. So, sodium tends to lose a electron i.e. 3s1 to obtain octet in its 2nd shell.
v. Chlorine tends to gain a electron to become 3p6 to obtain octet in its 3rd shell.
vii. So, sodium loses electron and gains positive charge and is called as sodium ion which is a cation - Na+1
viii. chlorine gains electron and gains negative charge and is called as chloride ion which is a anion – Cl-1
ix. ionic bond is formed by the transfer of electrons and the compound formed is sodium chloride.
i. Calcium oxide if formed by combination of calcium and oxygen.
ii. Calcium (20Ca40) configuration is 1s22s22p63s23p64s2.
iii. Oxygen (8O16) configuration is 1s22s22p4.
iv. Outer shell of calcium (4th) contains 2 electrons. So it tends to lose these
2 electrons to obtain octet in its 3rd shell which then becomes its outermost shell. Oxygen tends to gain 2 electrons to obtain octet in its outermost 2nd shell.
v. In this way, both calcium and oxygen become stable.
vi. So, calcium loses 2 electrons and gains positive charge and is called as calcium ion which is a cation – Ca+2
vii. oxygen gains 2 electrons and gains negative charge and is called as oxide ion which is an anion – O-2
viii. ionic bond is formed by the transfer of electrons and the compound formed is calcium oxide.
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