Advertisements
Advertisements
प्रश्न
Answer the following question:
State the four blocks of the modern periodic table based on the electronic configuration of elements.
उत्तर
Elements in the modern periodic table are classified on the basis of their electronic configuration. They are divided into four blocks: s – block, p – block, d – block, and f – block.
APPEARS IN
संबंधित प्रश्न
Name any two elements of group one and write their electronic configurations. What similarity do you observe in their electronic configurations? Write the formula of oxide of any of the aforesaid elements.
Na, Mg and Al are the elements of the same period of Modern Periodic Table having, one, two and three valence electrons respectively. Which of these elements (i) has the largest atomic radius, (ii) is least reactive? Justify your answer stating reason for each case.
Define the term : Valency
Define the term : Atomic size
Consider two elements 'X' (Atomic number 17) and 'Y' (Atomic number 20)
(i) Write the positions of these elements in the modern periodic table giving justification.
(ii) Write the formula of the compound formed by the combination of 'X' and 'Y'.
(iii) Draw the electron-dot structure of the compound formed and state the nature of the bond formed between the two elements ?
Use the letters only written in the Periodic Table given below to answer the questions that Follow :
1) State the number of valence electrons in atom J.
2) Which element shown forms ions with a single negative charge?
3)Which metallic element is more reactive than R?
4) Which element has its electrons arranged in four shells?
How does the number of valence electrons vary on moving from left or right in the second period of the periodic table?
Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of the periodic table. Write the electronic configuration of these two elements. Which of these will be more electronegative? Why?
How do atomic structures (electron arrangements) change in a period with increase in atomic numbers from left to right?
How does Nature of oxides of elements change on going from left to right in a period of the periodic table?
Give examples in support of your answer.
In which part of a group would you separately expect the elements to have the largest atomic size?
The elements A, B, C, D and E have atomic numbers 9, 11, 17, 12 and 13 respectively. The pair of elements which belongs to the same group of the periodic table is:
(a) A and B
(b) B and D
(c) A and C
(d) D and E
Where would you locate the element with electronic configuration 2, 8 in the modern periodic table?
Which one of the following does not increase while moving down the group of the periodic table?
What do you understand by periodicity?
State the valency of the elements of periods 3 and write the formula of their oxides.
An element A has atomic number 14. To which period does this element belong and how many elements are there in this period.
Why fluorine has higher E.N. than chorine?
An element barium has atomic number 56. Look up its position in the periodic table and answer the following question.
Is it more or less reactive than calcium?
An element X belong to 3rd periods and group II of the periodic table state:
the valency,
An element X belong to 3rd periods and group II of the periodic table state:
name of the element,
State whether the following statement is true or false
On moving horizontally across a period, number of valence electrons increases from one to eight.
'In a group, the atomic radii increase with increasing period number', explain this statement and justify it with reference to group 17.
State the number of elements in period 1, period 2 and period 3 of the periodic table.
How many elements are there in period 2?
Give the number of the group and the period of elements having three shells with three electrons in valence shell.
Choose the most appropriate answer from the following list of oxides which fit the description.
An amphoteric oxide: Al2O3 (shows both acidic and basic properties)
Arrange the following in order of increasing radii:
Mg2+, Mg, Mg+
The elements of one short period of the periodic table are given below in order from left to right:
| Li | Be | B | C | O | F | Ne |
Which one of the above elements belongs to the halogen series?
Write the electronic configuration of element 17T35.
- What is the group number of T?
- What is the period number of T?
- How many valence electrons are there in an atom of T?
- What is the valency of T?
- Is it a metal or non-metal?
- State number of protons and neutrons in T.
Name and state the following with reference to the elements of the first three periods of the periodic table.
Metalloid in Period 3.
Name and state the following with reference to the elements of the first three periods of the periodic table.
Alkaline earth metal in period 3.
Moving down in the second group, number of valence electrons ______.
An element A has 2 electrons in its fourth shell. State:
its valency
What is meant by a Group in the Periodic Table?
State the property trends in general of elements on moving from left to right in a period of the periodic table.
Name or state following with reference to the element of the first three periods of the periodic table.
A covalent compound formed between an element in period 1 and a halogen.
Select the correct answer from the options given below.
It is a metal in period 2 having electronic configuration 2, 1?
State the following:
The group to which the element with an electronic configuration of 2, 8, 2 belongs.
There are three elements E, F, G with atomic numbers 19, 8 and 17 respectively.
Classify the above elements as metals and non-metals.
