Build an atom
Subshells
Isotopes & A
r
Ionisation energies
Practice
protons
−
11
+
neutrons
−
12
+
electrons
−
11
+
electrons orbit
element (Z = 1–36)
remove / add electrons (ion)
−e
atom
+e
note the 4s / 3d order
noble-gas shorthand
isotope 1 · mass
35
isotope 1 · abundance
75.0 %
isotope 2 · mass
37
isotope 2 · abundance
25.0 %
isotope 3 · mass
26
build an atom
pick an element, then nudge the steppers
1
—
Answer
Check
Hint
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How to think about it
Common mistakes