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//! Principal quantum number (electron shell number) for elements.
use crate::isotopes::ElementVariant;
/// Number of electron shells in the atom.
pub trait PrincipalQuantumNumber {
/// Returns the principal quantum number (shell number).
///
/// # Examples
///
/// ```rust
/// use elements_rs::{Element, PrincipalQuantumNumber};
///
/// assert_eq!(Element::H.principal_quantum_number(), 1);
/// assert_eq!(Element::Li.principal_quantum_number(), 2);
/// ```
fn principal_quantum_number(&self) -> u8;
}
impl PrincipalQuantumNumber for crate::Element {
#[allow(clippy::too_many_lines)]
fn principal_quantum_number(&self) -> u8 {
match self {
Self::H | Self::He => 1,
Self::Li | Self::Be | Self::B | Self::C | Self::N | Self::O | Self::F | Self::Ne => 2,
Self::Na | Self::Mg | Self::Al | Self::Si | Self::P | Self::S | Self::Cl | Self::Ar => {
3
}
Self::K
| Self::Ca
| Self::Sc
| Self::Ti
| Self::V
| Self::Cr
| Self::Mn
| Self::Fe
| Self::Co
| Self::Ni
| Self::Cu
| Self::Zn
| Self::Ga
| Self::Ge
| Self::As
| Self::Se
| Self::Br
| Self::Kr => 4,
Self::Rb
| Self::Sr
| Self::Y
| Self::Zr
| Self::Nb
| Self::Mo
| Self::Tc
| Self::Ru
| Self::Rh
| Self::Pd
| Self::Ag
| Self::Cd
| Self::In
| Self::Sn
| Self::Sb
| Self::Te
| Self::I
| Self::Xe => 5,
Self::Cs
| Self::Ba
| Self::La
| Self::Ce
| Self::Pr
| Self::Nd
| Self::Pm
| Self::Sm
| Self::Eu
| Self::Gd
| Self::Tb
| Self::Dy
| Self::Ho
| Self::Er
| Self::Tm
| Self::Yb
| Self::Lu
| Self::Hf
| Self::Ta
| Self::W
| Self::Re
| Self::Os
| Self::Ir
| Self::Pt
| Self::Au
| Self::Hg
| Self::Tl
| Self::Pb
| Self::Bi
| Self::Po
| Self::At
| Self::Rn => 6,
Self::Fr
| Self::Ra
| Self::Ac
| Self::Th
| Self::Pa
| Self::U
| Self::Np
| Self::Pu
| Self::Am
| Self::Cm
| Self::Bk
| Self::Cf
| Self::Es
| Self::Fm
| Self::Md
| Self::No
| Self::Lr
| Self::Rf
| Self::Db
| Self::Sg
| Self::Bh
| Self::Hs
| Self::Mt
| Self::Ds
| Self::Rg
| Self::Cn
| Self::Nh
| Self::Fl
| Self::Mc
| Self::Lv
| Self::Ts
| Self::Og => 7,
}
}
}
impl PrincipalQuantumNumber for crate::Isotope {
fn principal_quantum_number(&self) -> u8 {
self.element().principal_quantum_number()
}
}
#[cfg(test)]
mod tests {
use strum::IntoEnumIterator;
use super::PrincipalQuantumNumber;
#[test]
fn test_principal_quantum_number() {
for element in crate::Element::iter() {
let n = element.principal_quantum_number();
assert!(
(1..=7).contains(&n),
"Principal quantum number should be between 1 and 7 for {element:?}",
);
}
}
#[test]
fn test_isotope_principal_quantum_number() {
for element in crate::Element::iter() {
let element_number = element.principal_quantum_number();
let isotopes = element.isotopes();
for isotope in isotopes {
let isotope_number = isotope.principal_quantum_number();
assert_eq!(
element_number, isotope_number,
"Principal quantum number mismatch for isotope {isotope:?} of element {element:?}",
);
}
}
}
}