Advertisements
Advertisements
प्रश्न
Find the odd one out and give its explanation.
पर्याय
Carbon
Calcium
Oxygen
Neon
Advertisements
उत्तर
Calcium
Explanation:
Carbon, oxygen, and neon are all classified as non-metals and are found in the p-block of the periodic table. Calcium, on the other hand, is an alkaline earth metal (Group 2) and is categorised as a metal, making it distinct from the others in terms of physical and chemical properties.
APPEARS IN
संबंधित प्रश्न
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.
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.
How does the tendency of elements to gain electrons change as we move from left to right in a period? State the reason of this change.
How were the positions of cobalt and nickel resolved in the modern periodic table?
Consider the following elements:
Na, Ca, Al, K, Mg, Li
Which of these elements belong to the same group of the periodic table?
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?
What is the main characteristic of the last elements in the periods of the periodic table? What is the general name of such elements?
(b) What is the number of elements is 3rd period, the modern periodic table?
From the standpoint of atomic structure, what determines which element will be the first and which the last in a period the periodic table?
What are the groups in a periodic table? Give two characteristics of each.
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?
Write a short note.
Position of isotopes in the Mendeleev’s and the modern periodic table.
What would be the correct order if Zn, Fe, Al and Cu are arranged in increasing order of reactivity?
How many periods and groups are there in the modern periodic table?
What is meant in the periodic table by a period?
What is the number of elements in the 3rd period, of the modern 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?
An element A has 2 electrons in its fourth shell. State its electronic configuration.
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.
Aluminium
Give the symbol and valency of the following element and radical.
Magnesium
Give the symbol and valency of the following element and radical.
Bisulphate
Give the symbol and valency of the following element and radical.
Sulphate
Compare Modern Periodic Law with Mendeleev's Periodic Law.
Find the correlation:
Group 13 to 18 : p block : : ______ : d block
Right or wrong sentence.
The modern periodic table shows the molecular masses of the elements in each frame.
Write a scientific reason.
There was ambiguity about the correct position of hydrogen in Mendeleev’s 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?
______ is the longest period in the periodical table.
______ forms the basis of the modern periodic table.
Which of the following elements does not lose an electron easily?
The three elements A, B and C with similar properties have atomic masses X, Y and Z respectively. The mass of Y is approximately equal to the average mass of X and Z. What is such an arrangement of elements called as? Give one example of such a set of elements.
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
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 Metalloid?
1H2 is an isotope of hydrogen. In the modern Periodic Table it will ______.
What is the general name of the last elements of the Periodic Table?
A group of elements in the periodic table is given below (Boron is the first member of the group and Thallium is the last).
Boron, Aluminium, Gallium, Indium, Thallium
Answer the following question in relation to the above group of elements:
If the electronic configuration of aluminium is 2, 8, 3, how many electrons are there in the outer shell of thallium?
