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प्रश्न
State the modern periodic law.
उत्तर
Modern periodic law states that "The physical and chemical properties of all elements are a periodic function of their atomic numbers".
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संबंधित प्रश्न
In the Modern Periodic Table, which are the metals among the first ten elements?
How does the electronic configuration of an atom relate to its position in the Modern Periodic Table?
State modern periodic law.
What is meant by a period, in a periodic table?
Give two example of group 1 elements.
Give two example of group 18 elements.
On which side of the periodic table will you find non-metals?
Would you place the two isotopes of chlorine, CI-35 and CI-37 in different slots because of their different atomic masses or in the same slot because their chemical properties are the same? Justify your answer.
Which element has two shells, both of which are completely filled with electrons?
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.
How do the atomic radii of elements change as we go from left to right in a period of the periodic table?
State how the valency of elements varies in a group of the 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?
Which of the following are the correct characteristics of isotopes of an element?
(i) same atomic mass
(ii) same atomic number
(iii) same physical properties
(iv) same chemical properties
(a) (i), (ii) and (iv)
(b) (ii), (iii) and (iv)
(c) (ii) and (iii)
(d) (ii) and (iv)
The following diagram shows a part of the periodic table in which the elements are arranged according to their atomic numbers. (The letters given here not the chemical symbols of the elements):
| a 3 |
b 4 |
c 5 |
d 6 |
e 7 |
f 8 |
g 9 |
h 10 |
|
| i 11 |
j 12 |
k 13 |
l 14 |
m 15 |
n 16 |
o 17 |
p 18 |
(i) Which element has a bigger atom, a or f?
(ii) Which element has a higher valency, k or o?
(iii) Which element is more metallic i or k?
(iv) Which element is more non-metallic, d or g?
(v) Select a latter which represents a metal of valency 2.
(vi) Select a letter which represents a non-metal of valency 2.
Name the metals in the first twenty elements.
Name the type of elements which have one electron short of octet.
State its position in the periodic table?
An element barium has the atomic number 56. Look up its position in the periodic table and answer the following question.
Is it larger or smaller than caesium (Cs)?
How will the tendency to gain electrons change as we go from left to right across a period? Why?
Name and state the following with reference to the elements of the first three periods of the periodic table.
A covalent compound formed by an element in period 2 and a halogen.
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.
Hydrogen
Give the symbol and valency of the following element and radical.
Aluminium
Give the symbol and valency of the following element and radical.
Magnesium
Give the symbol and valency of the following element and radical.
Chlorine [Chloride]
Give the chemical formula of sodium hydroxide
Give the chemical formula of sodium nitrate
Fill in the blank:
The element lithium in the Modern Periodic Table with valency 1+ belongs to the group ______.
Name the following:
The group of the Modern Periodic Table to which calcium [Ca2+] belongs.
The modern periodic table is divided into which blocks?
The modern periodic table has 1 to 7 periods.
Write scientific reason.
Lithium and sodium are included in the same group in periodic table.
______ forms the basis of the modern periodic table.
______ and ______ are called inner transition elements.
The arrangement of elements in the Modem Periodic Table is based on their ______
On moving from left to right in a period in the periodic table, the size of the atom ______
The element with atomic number 14 is hard and forms acidic oxide and a covalent halide. To which of the following categories does the element belong?
The longest period of the Modern Periodic Table is period.
What is the symbol of the element Tungsten?
Which of the following elements does not lose an electron easily?
“Hydrogen occupies a unique position in Modern Periodic Table”. Justify the statement.
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 a similar structure to diamond.
Group 16 elements are collectively called as ______.
The maximum number of electrons that can be accommodated in s, p,d, and f subshells are ______.
______ group elements are called alkaline earth metals.
Spot the error:
The elements of group 13 are called the carbon family.
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?
An element belonging to 3d series of modern periodic table has spin magnetic moment = 5.92 B.M. in +3 oxidation state. The atomic number of elements are ______.
Define periods of modern periodic table.
Name two elements that you would expect to show chemical reactions similar to calcium. What is the basis of your choice?
Name the metalloids in the first twenty elements.
An element has 2 electrons in its N shell.
State its position in periodic table.
Answer the following in respect of element \[\ce{_16^32S}\].
Give its electronic configuration.
