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प्रश्न
The groups 1 and 2 constitute the _______ block.
पर्याय
s
p
d
q
उत्तर
The groups 1 and 2 constitute the s block.
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संबंधित प्रश्न
Fill in the blank:
The modern periodic table consists of ……………. periods.
How does the metallic character of elements in Modern Periodic Table vary on moving from left to right in a period, and (ii) down a group?Give reason to justify your answer.
What is periodicity in properties of elements with reference to the Modern Periodic Table?
Name the scientist who prepared modern periodic table.
Which of the following statement is correct in regard to the classification of elements?
(a) Elements in modern periodic table are arranged on the basis of increasing atomic masses.
(b) Elements in Mendeleev's periodic table are arranged on the basis of increasing atomic numbers.
(c) In modern periodic table, the element nickel of lower atomic mass is kept before the element cobalt of higher atomic mass.
(d) In modern periodic table, the isotopes of chlorine having different atomic masses are kept in the same group.
What is a period in a periodic table?
What is the fundamental difference in the electron configurations between the group 1 and group 2 elements?
What is the number of elements is 1st period the modern periodic table?
What is a group in the periodic table?
In the modern Periodic Table, why does cobalt with higher atomic mass of 58.93 appear before nickel having lower atomic mass of 58.71?
The elements A, B, C and D belong to groups 1, 2, 14 and 17 respectively of the periodic table. Which of the following pairs of elements would produce a covalent bond?
(i) A and D
(ii) C and D
(iii) A and B
(iv) B and C
(v) A and C
Name the type of elements which have outermost shell incomplete.
The electronic configuration of an element T is 2, 8, 8, 1.
What is the period number of T?
Name the noble gas with 3 shells.
Write a short note.
Structure of the modern periodic table.
From the standpoint of atomic structure, what determines which elements will be the first and which the last in a period of the 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?
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?
Give the symbol and valency of the following element and radical.
Oxygen [Oxide]
Give the symbol and valency of the following element and radical.
Hydroxide
Give the chemical formula of magnesium nitrate
Mendeleev's periodic table : atomic mass : : Modern periodic table : _______
The modern periodic table shows the molecular masses of the elements in each frame.
In the modern periodic table, the positions of 1 to 20 elements are shown here. Identify the elements A and B. Write their atomic number.
An X element with atomic number 11 and Y element with atomic number 13 belongs to the third period in the modern periodic table. With this information, give the answers of the below questions.
- Which element has more metallic character from these two elements?
- What is the valency of each X and Y elements?
- Atom size of Y element is smaller than atom size of X element. Explain.
State any five features of modern periodic table.
______ is the longest period in the periodical table.
How does the property vary in periods and in groups?
The arrangement of elements in the Modem Periodic Table is based on their ______
The element which has the least tendency to lose electrons is ______
The longest period of the Modern Periodic Table is period.
Where would you locate the element with electronic configuration 2,8 in the Modern Periodic Table?
Which of the following is the outermost shell for elements of period 2?
Arrange the following elements in the increasing order of their metallic character
| Mg, | Ca, | K, | Ge, | Ga |
An element has the atomic number 12.
- Write the electric configuration.
- To which group and period does it belong.
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:
A and F
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?
Answer the following in respect of element \[\ce{_16^32S}\].
Give its electronic configuration.
Match the atomic number with the following:
An element of group 2.
