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प्रश्न
The K and L shells of the elements Na and Mg contain electrons.
विकल्प
Right
Wrong
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उत्तर
The K and L shells of the elements Na and Mg contain electrons- Right
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संबंधित प्रश्न
Give two example of group 1 elements.
Consider the following elements:
Na, Ca, Al, K, Mg, Li
Which of these elements belong to the same period of the periodic table?
How does the chemical reactivity of alkali metals vary on going in group 1 of the periodic table?
How do the atomic radii of elements change as we go from left to right in a period of the periodic table?
Explain why All the elements of a group have similar chemical properties.
Explain why All the elements of a period have different chemical properties.
Helium and neon are unreactive gases. What, if anything, do their atoms have in common?
What are the advantages of the periodic table?
The atomic numbers of the three elements X, Y and Z are 2, 6 and 10 respectively.
(i) Which two elements belong to the same group?
(ii) Which two elements belong to the same period?
Give reasons for your choice.
What is the main characteristic of the last element in each period of the periodic table?
State the main aim of classifying elements. Which is the more fundamental property of elements that is used in the development of Modern Periodic Table? Name and state the law based on this fundamental property. On which side of the periodic table one can find metals, non-metals and metalloids?
State the modern periodic law for classification of elements. How many (i) groups and (ii) periods are there in the modern periodic table?
Write a short note.
Structure of the modern periodic table.
How does number of (i) valence electrons (ii) valency; vary on moving from left to right in the second period of a periodic table?
Name an element of group 18 which can form compounds.
Give the symbol and valency of the following element and radical.
Potassium
Give the symbol and valency of the following element and radical.
Sodium
Give the symbol and valency of the following element and radical.
Oxygen [Oxide]
Give the symbol and valency of the following element and radical.
Nitrate
Give the symbol and valency of the following element and radical.
Bisulphate
Give the symbol and valency of the following element and radical.
Bisulphite
Give the symbol and valency of the following element and radical.
Sulphate
The d-block elements are called as _______ elements.
p-block is composed of groups 1 and 2.
Write an Explanation.
Period
Write scientific reason.
Lithium and sodium are included in the same group in periodic table.
Distinguish between:
Group 17 - Group 18
Explain structure of modern periodic table in short.
Identify gas A in the following experiment.
What is the symbol of the element Tungsten?
Which of the following elements does not lose an electron easily?
Choose an element from period 3 of modern periodic table that matches the description given below in instance. Give a reason for your choice.
It has same valency as Lithium.
Choose an element from period 3 of modern periodic table that matches the description given below in instance. Give a reason for your choice.
It has variable valency and is a member of the Oxygen family (group 16).
Explain the position of hydrogen in the periodic table.
- Write the electronic configuration of element X, given by its symbol as under: \[\ce{^40_20 X}\]
- Determine its position in the modem periodic table.
- What is the nature of its oxide?
- Name one other element of its group.
Name the following metal:
A metal present in period 3, group 1 of the periodic table.
Match the atomic number with the following:
A rare gas.
