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Question
Draw the geometric atomic structure of the following atom showing the number of electrons, protons and neutrons in them:
\[\ce{^40_20Ca}\]
Solution
Geometric atomic structure of:
A = P + n
40 = 20 + n
∴ n = 40 − 20 = 20 neutrons
e = 20
Electronic arrangement 2, 8, 8, 2
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RELATED QUESTIONS
Five atoms are labelled from A to E.
| Atoms | Mass No. | Atomic No. |
| A | 40 | 20 |
| B | 19 | 9 |
| C | 7 | 3 |
| D | 16 | 8 |
| E | 14 | 7 |
(a) Which one of these atoms:
(i) contains 7 protons,
(ii) has an electronic configuration 2, 7?
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Element |
W |
X |
Y |
Z |
|
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2, 8, 1 |
2, 8, 7 |
2, 5 |
1 |
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