Question

Q6) In 3 rd transition series each element has 18 electrons in the inner core of its atom which is like the noble gas electronic Configuration of- a) Ar b) Kr C) Xe d) Rn​

Answer 1

Answer:

a) Argon

is the answer. It has 18 electrons.

hope it helps...

Answer 2

The 3d Transition elements (with atomic number in brackets) are:

• Scandium (21)
• Titanium (22)
• Vanadium (23)
• Chromium (24)
• Manganese (25)
• Iron (26)
• Cobalt (27)
• Nickel (28)
• Copper (29)
• Zinc (30)

In all these elements , the electronic configuration go as :

• Sc : [Ar] 4s² 3d¹
• Ti : [Ar] 4s² 3d²
• V :[Ar] 4s² 3d³
• Cr :[Ar] 4s¹ 3d⁵
• Mn :[Ar] 4s² 3d⁵
• Fe : [Ar] 4s² 3d⁶
• Co : [Ar] 4s² 3d⁷
• Ni : [Ar] 4s² 3d⁸
• Cu : [Ar] 4s¹ 3d¹⁰
• Zn : [Ar] 4s² 3d¹⁰

$\star$ So, they have an inner core of Argon gas (Noble Gas).

• Another method to remember this is that : Argon's atomic number is 18 , hence has 18 electrons which is also the number of electrons present in the core of 3d transition elements.