Please select a subject first
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Name the type of elements which have two electrons in the outermost orbit.
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State its position in the periodic table?
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Answer the following in respect of element `31/15 P `
To which group and period does it belong?
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Arrange the elements of second and third periods in increasing order of their atomic size.
Third Period.
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How do atoms attain noble gas configuration?
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How does the electronic configuration of an atom relate to its position in the modern periodic table?
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Write the number of protons, neutrons and electronic configuration of \[\ce{_19^39K, _15^31P}\]. Also state their position in periodic table.
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Answer the following in respect of element `31/15 P`
Give its electronic configuration
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What is the main characteristic of the last element in each period of the periodic table?
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Mention the basic tendency of an atom which makes it to combine with other atoms.
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Fill in the blank:
The horizontal rows in the periodic table are called _____________.
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An element barium has atomic number 56. Look up its position in the periodic table and answer the following question.
What will be the formula of its phosphate?
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Elements A, B and C have atomic number 17, 19 and 10 respectively.
State which one is a non-metal.
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An element barium has the atomic number 56. Look up its position in the periodic table and answer the following question.
Is it larger or smaller than caesium (Cs)?
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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?
(b) Write down the formula of the compound formed between C and D.
(c) predict which are: (i) metals, (ii) non-metals?
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The electronic configuration of an element T is 2, 8, 8, 1.
What is the group number of T?
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The electronic configuration of an element T is 2, 8, 8, 1.
What is the period number of T?
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Match the atomic number 4, 8, 14, 15 and 19 with each of the following:
(a) A solid non-metal of valelncy 3.
(b) A gas of valency 2.
(c) A metal of valency 1.
(d) A non-metal of valency 4
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Elements X, Y, and Z have atomic numbers 6, 9 and 12 respectively. Which one forms an anion?
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