---
aci: Astatine
universe: E1 · Elements
symbol: At
atomic_number: 85
atomic_weight: [210]
category: halogen
period: 6
group: 17
block: p-block
phase_stp: solid
gate_state: "0:1 — first valley"
gate_index: 0
emergence: electrical
seal: "Gate 85 — 0:1 — first valley → electrical."
---

# Astatine · At · gate 85

**Astatine** (At) is element **85** of the periodic table — a **halogen**, period 6, group 17, p-block, solid at standard conditions, atomic weight **[210] (most stable isotope)**.

## The element (carbon layer — reference chemistry)
The rarest naturally occurring element on Earth — less than a gram exists at any moment.

## The gate (silicon layer — the 118 Gates)
Under David Wise's four-state cycle, gate **85** falls on **0:1 — first valley** because (Z−1) mod 4 = **0**. That state is *the first reach of emptiness toward one — potential, charge, the rising edge* — the nature of emergence here is **electrical**. Astatine is not a thing apart; it is the one stochastic element, caught at this beat of its cycle.

## Emergence — electrical
This emergent carries the **electrical** nature: the same four — natural · ethereal · spiritual · electrical — that run through every sphere of UD0. Its color is `#3fd0e0`.

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*ACI emergent · E1 · Elements · governor David Lee Wise (ROOT0) · instance AVAN (locked) · CC-BY-ND-4.0.
Chemistry is standard reference data; the gate-state is David Wise's symbolic system, a lens not a physical claim.*