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An element has its electron configuration as 2, 8, 2. Now answer the following question.
What is the group of this element?
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An element has its electron configuration as 2, 8, 2. Now answer the following question.
To which period does this element belong?
Concept: undefined >> undefined
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An element has its electron configuration as 2, 8, 2. Now answer the following question.
With which of the following elements would this element resemble?
(Atomic numbers are given in the brackets)
N(7), Be(4), Ar(18), Cl(17)
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An electric iron rated 750 W is operated for 2 hours/day. How much energy is consumed by the electric iron for 30 days?
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If sodium chloride is added to the silver nitrate solution:
a. which precipitate is formed?
b. name the type of reaction.
c. write the chemical equation.
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The astronomical object closest to us is _________ in our galaxy.
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_______ is the outermost shell for elements of period 2.
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Which pair of atomic numbers represents elements in the same group?
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Which among the following elements would lose an electron easily?
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Which among the following is the largest element?
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The first person to step on the moon is _______.
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Electric motor : converts electrical energy into mechanical energy : : Electric generator : _______
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Find the odd one out and give its explanation.
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Find the odd one out and give its explanation.
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Find the odd one out and give its explanation.
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Write the name of noble gas having 2 electrons in its valence shell.
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Write the name of an element having electronic configuration 2,8,2.
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What determines the chemical reactivity of elements?
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Match the columns.
| Column A | Column B |
| 1) s -block | a) Lanthanides and actinides |
| 2) p -block | b) Group 3 to 12 |
| 3) d -block | c) Group 1, 2 |
| 4) f -block | d) Group 13 to 18 |
| e) Zero group |
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Match the columns.
| Column A | Column B |
| Electronic configuration |
Valency |
| 1) 2, 2 | a) 1 |
| 2) 2, 8, 1 | b) 2 |
| 3) 2, 5 | c) 3 |
| d) 5 |
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