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प्रश्न
Find the odd one out and give its explanation.
पर्याय
Carbon
Calcium
Oxygen
Neon
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उत्तर
Calcium
Explanation-
Calcium is a s-block element while others are p-block elements.
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संबंधित प्रश्न
In the Modern Periodic Table, calcium (atomic number 20) is surrounded by elements with atomic numbers 12, 19, 21, and 38. Which of these have physical and chemical properties resembling calcium?
Compare and contrast the arrangement of elements in Mendeleev’s periodic Table and the Modern Periodic Table.
Write the names given to the vertical columns and horizontal rows in the Modern Periodic Table. How does the metallic character of elements vary on moving down a vertical column? How does the size of atomic radius vary on moving left to right in a horizontal row? Give reason in support of your answer in the above two cases.
Give two example of group 18 elements.
Which element has the electronic configuration 2, 8, 2?
How does the chemical reactivity of alkali metals vary on going in group 1 of the periodic table?
What is the number of valence electrons in the atoms of first elements in a period?
Explain why All the elements of a group have similar chemical properties.
State how the valency of elements varies in a group of the periodic table?
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.
What are horizontal rows and vertical columns in a periodic table known as?
Name two elements in each case: Lanthanides
Name the metals in the first twenty elements.
Answer the following in respect of element `31/15 P `
To which group and period does it belong?
The electronic configuration of an element T is 2, 8, 8, 1.
What is the group number of T?
An element E has following electronic configuration:
|
K |
L |
M |
|
2 |
8 |
6 |
(a) To which group of the periodic table does element E belong?
(b) To which period of the periodic table does element E belong?
(c) State the number of valence electrons present in element E.
(d) State the valency of the element E.
What would be the correct order if Zn, Fe, Al and Cu are arranged in increasing order of reactivity?
State the modern periodic law.
Name the cation and the anion in the salt – calcium sulphate
Give the symbol and valency of the following element and radical.
Zinc
Give the chemical formula of sodium hydroxide
Give the chemical formula of ammonium sulphate
Name the following:
The group of the Modern Periodic Table to which calcium [Ca2+] belongs.
What are the elements.
What are the periods in a periodic table?
The d-block elements are called as _______ elements.
The modern periodic table is divided into which blocks?
The modern periodic table shows the molecular masses of the elements in each frame.
The K and L shells of the elements Na and Mg contain electrons.
State any five features of modern periodic table.
______ forms the basis of the modern periodic table.
How does the property vary in periods and in groups?
Which of the following is the outermost shell for elements of period 2?
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?
- Write the electronic configuration of element X, given by its symbol as under: \[\ce{^40_20 X}\]
- Determine its position in the modem periodic table.
- What is the nature of its oxide?
- Name one other element of its group.
Define periods of modern periodic table.
Define groups of modern periodic table.
An element with atomic number ______ will form a basic oxide.
Answer the following in respect of element \[\ce{_16^32S}\].
Give its electronic configuration.
