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Question
Complete the following flow chart.
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Solution
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Fill in the blank:
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Group 17 elements are known as ...............
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Name the type of elements which have one electron short of octet.
Fill in the blank:
The horizontal rows in the periodic table are called _____________.
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Write a short note.
Structure of the modern periodic table.
Write a short note.
Position of isotopes in the Mendeleev’s and the modern periodic table.
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How does number of (i) valence electrons (ii) valency; vary on moving from left to right in the second period of a periodic table?
Answer the following question.
How it can be proved that the basic structure of the Modern Periodic Table is based on the electronic configuration of atoms of different elements?
In the Modern Periodic Table – atoms of all elements are arranged according to their increasing order of – atomic numbers. An atom of nitrogen has seven protons and seven electrons. State what would be its atomic number.
Give the symbol and valency of the following element and radical.
Potassium
Give the symbol and valency of the following element and radical.
Ammonium
Give the symbol and valency of the following element and radical.
Hydroxide
Give the chemical formula of sodium nitrate
Give the chemical formula of magnesium nitrate
State the number of elements in Period 2 of the Periodic Table.
Elements in the modern periodic table are arranged in ______groups and______ periods.
Noble gases belong to______ group of the periodic table.
______ is the longest period in the periodical table.
______ and ______ are called inner transition elements.
Which of these belong to the same period?
| Element | A | B | C |
| Atomic number | 2 | 10 | 5 |
The longest period of the Modern Periodic Table is period.
What is the symbol of the element Tungsten?
The three elements A, B and C with similar properties have atomic masses X, Y and Z respectively. The mass of Y is approximately equal to the average mass of X and Z. What is such an arrangement of elements called as? Give one example of such a set of elements.
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An element with atomic number ______ will form a basic oxide.
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An element has 2 electrons in its N shell.
State its position in periodic table.
