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Question
Elements A, B and C have atomic number 17, 19 and 10 respectively.
State which one is chemically inert.
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Solution
Electronic configuration of element A = (2, 8) at atomic no. 10
∴ Element C having 8 electrons in outer most orbit is chemically inert.
RELATED QUESTIONS
Give electron dot diagram of the following:
Magnesium chloride
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methane
State the following is a reduction reaction or oxidation reaction.
\[\ce{Pb -> Pb^2+ + 2e-}\]
What is the contribution of the following in atomic structure?
Democritus
Five atoms are labeled 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 electronic configuration 2,7
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nitrate
phosphate
carbonate
hydroxide.
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Magnesium chloride
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\[\ce{^23_11Na}\]
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