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प्रश्न
Define periods of modern periodic table.
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उत्तर
The horizontal rows are called periods. The table consists of 7 periods, numbered from 1 to 7 from top to bottom.
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संबंधित प्रश्न
How many rows and columns are there in the modern periodic table?
What is periodicity in properties of elements with reference to the Modern Periodic Table?
Fill in the following blank with suitable word:
Group 18 elements are called ...............
How many periods and groups are there in the long form of periodic table?
Give two example of group 18 elements.
What is the significance of atomic number in the modern classification of elements? Explain with the help of an example.
Explain why, the noble gases are placed in a separate group.
Is it possible to have an element having atomic number 1.5 placed between hydrogen and helium?
State how the valency of elements varies in a period of the periodic table?
What is the fundamental difference in the electron configurations between the group 1 and group 2 elements?
What happens to the number of valence electrons in the atoms of elements as we go down in a group of 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 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 two elements in halogens.
Name the type of elements which have two outermost shell incomplete.
Answer the following in respect of element `31/15 P `
To which group and period does it belong?
How does the electronic configuration of an atom relate to its position in the modern periodic table?
What is the main characteristic of the last element in each period of the periodic table?
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.
Write a short note.
Structure of the modern periodic table.
What would be the correct order if Zn, Fe, Al and Cu are arranged in increasing order of reactivity?
What is meant in the periodic table by a period?
Name an element of group 18 which can form compounds.
Define the atomic size.
Give the symbol and valency of the following element and radical.
Sodium
Give the symbol and valency of the following element and radical.
Nitrogen [Nitride]
Give the symbol and valency of the following element and radical.
Sulphite
Give the chemical formula of sodium nitrate
How were elements arranged in the long form of the periodic table or the Modern Periodic Table?
Find the odd one out and give its explanation.
______ is the longest period in the periodical table.
Spot the error:
There are 5 periods and 17 groups in the modern periodic table.
An element with atomic number ______ will form a basic oxide.
Name the non-metals in the first twenty elements.
An element has 2 electrons in its N shell.
State its position in periodic table.
