Because copper loose electron from its penultimate outer shell
Silver (Ag) has an atomic number of 47, and its electron configuration is [Kr] 4d¹⁰ 5s¹. The sub-shell being filled by silver is the 4d sub-shell, which is fully filled with 10 electrons. Additionally, the single electron in the 5s sub-shell contributes to its chemical properties.
Manganese (Mn) has a total of 25 electrons, and its electron configuration is [Ar] 3d^5 4s^2. In the 3d sub-shell, manganese has 5 electrons.
He does not have a p sub-shell in the valent shell. Because He has the noble gas configuration it is included in the p block.
Chromium has atomic no. of 24. Its electronic configuration is 1s22s22p63s23p64s13d5 . It should be 4s23d4 but it is not because the half filled d-sub shell provides extra stability to chromium atom.
A break down of 2d1:2 = the quantum energy level or electron shell denoted as 'n'd = the sub-shell of the energy level (known as a degenerate level)1 = the number of electrons occupying the sub-shell.Through extensive research by scientists, no known element has a d sub-shell in the second (n=2) energy level. In fact, the d sub-shell does not appear until the fourth period (fourth row).The first d sub-shell is known to be in the third energy level (therefore the first energy level with this sub-shell is 3d, but not 2d).Transition metals are the elements known to fill the d sub-shells. The first transition metal in the periodic table is scandium (Sc) with the electron configuration of [Ar]4s23d1.The reasons for the formation of sub-shell of d is beyond my knowledge and the scope of basic chemistry.
The second shell of an atom has two sub-shells: the 2s and 2p sub-shells. The 2s sub-shell can hold a maximum of 2 electrons, while the 2p sub-shell can hold a maximum of 6 electrons, allowing the second shell to accommodate a total of 8 electrons.
You can tell the difference between a 2s sub-shell and 2p sub-shell from their energy levels, because a 2p sub-shell is a higher energy level than a 2s sub-shell.
they are both the same meaning
The sub-level s of energy that make the o shell is the K-shell.
local Variable A Local variable is a variable whose scope is limited to the Block of the Subroutine defining it. Private Sub Command1_Click Dim a as integer End Sub Module Level Variable A Module Level variable is a variable whose scope is limited to the Form Module defining it. Public Sub Command1_Click Dim a as integer End Sub Global Level Variable A Global Level variable is a variable whose scope can be limited to the entire project defining it. Private Sub Classjnitialize () Dim a As Integer End Sub
1s2, 2s2, 2p6, 3s2, 3p3 The prefix number is the energy shell number. No.1 being the inner most shell 's' or 'p' is the character of the shell. The suffix number is the number of electrons in that sub-shell.
Local Variable A Local variable is a variable whose scope is limited to the Block of the Subroutine defining it. Private Sub Command1_Click Dim a as integer End Sub Module Level Variable A Module Level variable is a variable whose scope is limited to the Form Module defining it. Public Sub Command1_Click Dim a as integer End Sub Global Level Variable A Global Level variable is a variable whose scope can be limited to the entire project defining it. Private Sub Class_Initialize () Dim a As Integer End Sub