BohrAtom

The Bohr model of an element: its symbol on the nucleus and its electrons on rings, shell_gap pixels apart. The shells come from the ground state configuration, so copper is 2, 8, 18, 1. After delay the electrons appear one by one over fill seconds, innermost shell first. Every shell turns, the outer ones slower (speed radians a second on the first). With labels the name and the electrons per shell sit under the atom. Gallery scene: BohrAtom (sodium and chlorine).

BohrAtom 5 sPlayUnmuteCopy render command

use fframes_kit::prelude::*;

fn figure<'a>(ui: &mut Ui<'a, '_, '_>) -> Svgr<'a> {
    ui.show(BohrAtom {
        element: 11,
        center: (-3.6, 0.0),
        shell_gap: 50.0,
        delay: 0.5,
        enter: Some(Create::default().into()),
        ..ui.defaults()
    })
}

API

Components are plain structs. Set the fields you need and fill the rest with ..ui.defaults(): the defaults below come from the current theme (theme. values are fields of Theme).

BohrAtom

Field	Type	Default	Description
element	u32	11	Atomic number of the element drawn (11 is sodium).
center	(f64, f64)	(0.0, 0.0)	The middle of the nucleus, in units of ui.space.
nucleus_radius	f32	46.0	Radius in pixels of the nucleus disc that carries the symbol.
shell_gap	f32	56.0	Distance in pixels between neighbouring shell rings, and from the nucleus to the first.
electron_radius	f32	10.0	Radius in pixels of an electron dot.
delay	f32	0.0	Seconds after the container’s start before the electrons begin to appear.
fill	f32	1.5	Seconds the electrons take to appear one after another, innermost shell first.
speed	f32	1.2	Turning speed of the first shell in radians per second; outer shells turn slower.
labels	bool	true	Writes the element name and the electrons per shell under the atom; false for none.
nucleus_color	Color	theme.colors.accent	Colour of the nucleus disc.
shell_color	Color	theme.colors.muted	Colour of the shell rings.
electron_color	Color	theme.colors.highlight	Colour of the electron dots.
text_color	Color	theme.colors.text	Colour of the name and shell count label under the atom.
stroke_width	f32	theme.stroke.thin	Outline width in pixels of the shell rings.
enter	Option<EnterAnim>	None	How the shell rings appear; None shows them from the start.
exit	Option<ExitAnim>	None	How the shell rings leave at the end of the container; None stays.
parts_enter	Option<FadeIn>	None	Fade in of the nucleus, electrons and labels; None for none.
parts_exit	Option<FadeOut>	None	Fade out of the nucleus, electrons and labels before the end; None for none.

Methods:

• fn shell_radius(&self, index: usize) -> f64: The radius in pixels of shell index (0 innermost).
• fn electron_angle(&self, index: usize, slot: u32, count: u32, t: f64) -> f64: The angle in radians of electron slot of the count on shell index, t seconds after delay: evenly spaced, turning at speed / (index + 1).

Feature chemistry · Source