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प्रश्न
Write an Explanation.
Period
उत्तर
The seven horizontal rows in the modern periodic table are called as periods.
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संबंधित प्रश्न
How does the electronic configuration of an atom relate to its position in the Modern Periodic Table?
Fill in the following blank with suitable word:
The horizontal rows in a periodic table are called ...............
Consider the following elements:
Ca, Cl, Na, I, Li, Ba, Sr, K, Br
Separate these elements into three groups (families) of similar properties. State one property in each case on the basis of which you have made your choice.
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.
Explain why All the elements of a group have similar chemical properties.
What are the merits of the modern periodic table of elements?
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.
Correct the statement.
Copper and zinc are representative elements.
State the modern periodic law for classification of elements. How many (i) groups and (ii) periods are there in the modern periodic table?
State the modern periodic law.
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.
Bicarbonate
Give the chemical formula of ammonium sulphate
Fill in the blank:
The element lithium in the Modern Periodic Table with valency 1+ belongs to the group ______.
State the number of elements in Period 1 of the Periodic Table.
State the number of elements in Period 2 of the Periodic Table.
What are the periods in a periodic table?
The groups 1 and 2 constitute the _______ block.
Find the odd one out and give its explanation.
Find the odd one out and give its explanation.
The modern periodic table is divided into which blocks?
The modern periodic table has 1 to 7 periods.
The K and L shells of the elements Na and Mg contain electrons.
Write scientific reason.
Lithium and sodium are included in the same group in periodic table.
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.
The scientist who propounded the modern periodic law is ______.
The longest period of the Modern Periodic Table is period.
The inert gas which lies in the third period is ______
The elements A, B, C, D and E have atomic number 9, 11, 17, 12 and 13 respectively. Which pair of elements belong to the same group?
Where would you locate the element with electronic configuration 2,8 in the Modern Periodic Table?
“Hydrogen occupies a unique position in Modern Periodic Table”. Justify the statement.
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.
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
Explain giving reason why although the nuclear charge in atoms increases in moving from left to right in a period as well as in moving from top to bottom in a group in the Modern periodic table, but the size of the atoms does not vary similarly in both situations.
Define groups of modern periodic table.
Give reason for the following:
Inert gases do not form ion.
