Advertisements
Advertisements
प्रश्न
Answer the following question in one sentence.
The modern periodic table is divided into which blocks?
Advertisements
उत्तर
The modern periodic table is divided into s-block, p-block, d-block, and f-block.
APPEARS IN
संबंधित प्रश्न
Name two elements you would expect to show chemical reactions similar to magnesium. What is the basis for your choice?
How does the electronic configuration of an atom relate to its position in the Modern Periodic Table?
How were the positions of isotopes of an element decided in the modern periodic table?
Which of the following statement about the modern periodic table is correct?
(a) It has 18 horizontal rows known as periods.
(b) It has 7 vertical columns known as periods.
(c) It has 18 vertical columns known as groups.
(d) It has 7 horizontal rows known as groups.
State whether the following statement is true or false:
On going down in a group of the periodic table, the number of valence electrons increases.
What is the main characteristic of the last elements in the periods of the periodic table? What is the general name of such elements?
What are horizontal rows and vertical columns in a periodic table known as?
Correct the statement.
Copper and zinc are representative elements.
What do you understand by typical elements?
Arrange the elements of second and third periods in increasing order of their atomic size.
Third Period.
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?
The electronic configuration of an element T is 2, 8, 8, 1.
What is the group number of T?
Name an alkali metal in period 3 and halogen in period 2.
How does number of (i) valence electrons (ii) valency; vary on moving from left to right in the second period of a periodic table?
Two elements P and Q belong to the same period of the modern periodic table and are in group 1 and group 2, respectively. Compare the following characteristics in the tabular form.
- Number of electrons in their atoms
- Their tendency to lose electrons
- Their metallic characters
- Formation of their oxides
- Formulae of their chlorides
Define the atomic size.
Give the symbol and valency of the following element and radical.
Calcium
Give the symbol and valency of the following element and radical.
Aluminium
Give the symbol and valency of the following element and radical.
Hydroxide
Give the chemical formula of sodium bicarbonate
What are the elements.
How were elements arranged in the long form of the periodic table or the Modern Periodic Table?
Find the correlation:
Group 1 and 2 : s block : : group 13 and 18 : ______
Right or wrong sentence.
The K and L shells of the elements Na and Mg contain electrons.
______ and ______ are called inner transition elements.
The amount of energy released when one or more electrons is added to the neutral atom is ______
Where would you locate the element with electronic configuration 2,8 in the Modern Periodic Table?
An element X which is a yellow solid at room temperature shows catenation and allotropy. X forms two oxides which are also formed during the thermal decomposition of ferrous sulphate crystals and are the major air pollutants.
- Identify the element X
- Write the electronic configuration of X
- Write the balanced chemical equation for the thermal decomposition of ferrous sulphate crystals?
- What would be the nature (acidic/ basic) of oxides formed?
- Locate the position of the element in the Modern Periodic Table.
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.
A part of modern periodic table is given below. On its basis, answer the following questions:
| Group No. → | 1 | 2 | 13 | 14 | 15 | 16 | 17 | 18 |
| Period ↓ | ||||||||
| 2 | A | B | ||||||
| 3 | E | D | F | C |
Write the molecular formula of the compound formed by the combination:
E and B
A part of modern periodic table is given below. On its basis, answer the following questions:
| Group No. → | 1 | 2 | 13 | 14 | 15 | 16 | 17 | 18 |
| Period ↓ | ||||||||
| 2 | A | B | ||||||
| 3 | E | D | F | C |
Which of the element is a Noble gas?
Give the criteria on the basis of which elements are placed (i) in a group and (ii) in a period in the modern periodic table. The atomic number of an element is 16. According to the criteria, in which group and period it should be placed?
Define groups of modern periodic table.
State the group and period, of the element having three shells with three electrons in valence shell.
Name the non-metals in the first twenty elements.
Match the atomic number with the following:
An element of group 2.
Give reason for the following:
Inert gases do not form ion.
