The table shows the nuclide notation for six atoms. Atom Nuclide notation Protons Neutrons Electrons Electron arrangement A 73Li B 126C C 146C D 199F E 2311...
Question 1 Report
The table shows the nuclide notation for six atoms.
| Atom | Nuclide notation | Protons | Neutrons | Electrons | Electron arrangement |
|---|---|---|---|---|---|
| A | 73Li | ||||
| B | 126C | ||||
| C | 146C | ||||
| D | 199F | ||||
| E | 2311Na | ||||
| F | 4020Ca |
(a) Complete the table for all six atoms. [6]
Answer Details
(a) Completed table [6]
In nuclide notation AZX, the subscript Z is the proton number (atomic number) and the superscript A is the mass number (nucleon number). For neutral atoms, electrons = protons. Neutrons = mass number − proton number.
| Atom | Nuclide notation | Protons | Neutrons | Electrons | Electron arrangement |
|---|---|---|---|---|---|
| A | 73Li | 3 | 7 − 3 = 4 | 3 | 2, 1 |
| B | 126C | 6 | 12 − 6 = 6 | 6 | 2, 4 |
| C | 146C | 6 | 14 − 6 = 8 | 6 | 2, 4 |
| D | 199F | 9 | 19 − 9 = 10 | 9 | 2, 7 |
| E | 2311Na | 11 | 23 − 11 = 12 | 11 | 2, 8, 1 |
| F | 4020Ca | 20 | 40 − 20 = 20 | 20 | 2, 8, 8, 2 |
[1] per row
Note that atoms B and C are both carbon (same proton number, 6) but have different numbers of neutrons (6 and 8). They are isotopes of carbon: B is carbon-12 (the common stable form) and C is carbon-14 (the radioactive isotope used in radiocarbon dating). Despite having different mass numbers, their electron arrangements are identical (2, 4), so they have the same chemical properties.
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