How do you write the noble gas notation for an element?
A noble gas configuration of an atom consists of the elemental symbol of the last noble gas prior to that atom, followed by the configuration of the remaining electrons. So for sodium, we make the substitution of [Ne] for the 1s22s22p6 part of the configuration. Sodium’s noble gas configuration becomes [Ne]3s1.
How many valence electrons does a noble gas from the periodic table have?
eight valence electrons
In which orbitals would the valence electrons for selenium?
1 Answer. Valence electrons of selenium will be placed in s and p-orbitals. Explanation: Valence electrons are defined as the electrons present in the last shell of any element.
Which is the noble gas notation for lead Pb )?
The noble-gas notation for lead (Pb) would be [Xe]6s^2 4f^14 5d^10 6p^2.
What is the configuration for PB?
[Xe] 4f¹⁴ 5d¹⁰ 6s² 6p²
What is the difference between an atom’s ground state and excited state?
What is the difference between the ground state and the excited state of an atom? The ground state is the lowest energy state of the atom. When the atom absorbs energy, it can move to a higher energy state, or excited state. When an atom loses energy, it falls from a higher energy state to a lower energy state.
How do you determine ground state?
If the unfilled subshell has more than half of the maximum number of electrons (e.g. oxygen, 2s2 2p4 ) the third Hund’s rule applies conversely, thus the ground state will be the multiplet term with the maximum total spin.
Which is higher in energy 3d or 4s?
The 3d orbitals have a slightly higher energy than the 4s orbitals. So because the 4s orbitals has the lower energy, it gets filled first. When 3d orbitals are filled, 4s is no longer lower in energy.
Is 3d or 4s orbital bigger?
Explain: According to Aufbau principle , electrons first occupy the lowest energy orbital available to them and enter into higher energy orbitals only after the lower energy orbitals are filled . Therefore , 3d orbital is higher in energy than 4s . And hence electrons fill up in 4s before filling up in 3d .
What does the energy of an orbital depend on?
Thus, the energy of orbitals depends upon the values of both the principal quantum number (n) and the azimuthal quantum number (l). Hence, the lower the value of (n + l) for an orbital, the lower is its energy.