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Write the name and symbol of the element from the description.
The noble gas with the smallest atomic radius.
Concept: Periodic Properties >> Atomic Size
Write a scientific reason.
Metallic character goes on decreasing while going from left to right in a period.
Concept: Metallic and Non-metallic Characters
Write the names from the description.
The metalloids in the second and third periods.
Concept: The Modern Periodic Table >> Structure of the Modern Periodic Table
Write the names from the description.
Non-metals in the third period.
Concept: The Modern Periodic Table >> Structure of the Modern Periodic Table
Write the names from the description.
Two elements having valency 4.
Concept: The Modern Periodic Table >> 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?
Concept: The Modern Periodic Table
Atomic number of metal ‚A‛ is 11, while atomic number of metal ‚B‛ is 20. Which of them will be more reactive? Write the chemical reaction of dilute HCl with metal ‚A‛.
Concept: Periods and Electronic Configuration
An element has its electron configuration as 2,8,2. Now answer the following questions.
i. What is the atomic number of this element?
ii. What is the valency of this element?
iii. What is the group of this element?
iv. To which period does this element belong?
v. With which of the following elements would this element resemble?
`_7N , _4Be , _18Ar , _17CL`
Concept: The Modern Periodic Table >> Modern Periodic Table and Electronic Configuration of Elements
The halogen which is liquid at room temperature is ..................
Concept: Gradation in Halogen Family
iii) Observe the figure and answer the following questions.
a) Identify the block shown by box A and write an electronic configuration of any one element of this block.
b) Identify the block of element denoted by letter B and write its period number.
Concept: Metallic and Non-metallic Characters
Which of this element belong to the period 3? Write their electronic configuration
`3^(Li) , 14^(Si) , 2^(He) , 15^(P)`
Concept: The Modern Periodic Table >> Modern Periodic Table and Electronic Configuration of Elements
Study the radius of the element given below and answer the following questions.
| elements | K | Na | Rb | Cs | Li |
| Atomic radius (pm) | 231 | 186 | 244 | 262 | 151 |
a) Which of the above elements have the smallest atom?
b) In which group of the modern periodic table the above element are belongs?
c) What is the periodic trend observed in the variation of atomic radii down a group?
Concept: Periodic Properties >> Atomic Size
Taking into consideration the period of the elements given below, answer the following questions:
| Elements | Atomic Radius (pm) |
| O | 66 |
| B | 88 |
| C | 77 |
| N | 74 |
| Be | 111 |
| Li | 152 |
- Arrange the above elements in decreasing order of their atomic radii.
- State the period to which the above elements belong.
- Why this arrangement of elements is similar to the above period of modern periodic table?
- Which of the above elements have the biggest and the smallest atom?
- What is the periodic trend observed in the variation of atomic radius while going from left to right within a period?
Concept: Periods and Electronic Configuration
State the modern periodic law.
Concept: The Modern Periodic Table
Fill in the blank and rewrite the completed statement:
________ group in the periodic table contains elements that are all gases at room temperature.
Concept: Periods and Electronic Configuration
Concept: Periods and Electronic Configuration
Answer the following question:
State the four blocks of the modern periodic table based on the electronic configuration of elements.
Concept: Periods and Electronic Configuration
Distinguish between:
s-block - p-block
Concept: The Modern Periodic Table
Position of A, B and C three elements is given in the table from the modern periodic table. Answer the following questions.
| Periods | Group 2 | Group 17 |
| 2 | ----- | A |
| 3 | B | ----- |
| 4 | ----- | C |
- What is A element metal or nonmetal?
- Which is the outermost orbit of element B?
- Identify C element and it's physical state.
Concept: The Modern Periodic Table
Observe the given chart and answer the questions given below.
| Element | A | B | C | D |
| Electronic configuration | 2, 1 | 2, 8 | 2, 8, 1 | 2, 8, 8 |
- Which elements are in the same row?
- Which elements have the same column?
- Which elements are in the 18th column?
- Which element is more reactive among A and C?
- Which of the following elements A or B will form compounds?
Concept: The Modern Periodic Table >> Modern Periodic Table and Electronic Configuration of Elements
