Advertisements
Advertisements
प्रश्न
An element has its electron configuration as 2, 8, 2. Now answer the following question.
To which period does this element belong?
Which row does this element belong to?
Advertisements
उत्तर
The element with an electron configuration of 2, 8, 2 belongs to the third period of the periodic table. The period number corresponds to the number of electron shells or energy levels occupied by electrons in an atom. Since this configuration indicates electrons in three shells (2 electrons in the first shell, 8 in the second, and 2 in the third), the element is in the third period.
APPEARS IN
संबंधित प्रश्न
Write down the electronic configuration of the following elements from the given atomic numbers. Answer the following question with explanation.
7N, 6C, 8O, 5B, 13Al Which is the most electronegative element among these?
Write down the electronic configuration of the following elements from the given atomic numbers. Answer the following question with explanation.
4Be, 6C, 8O, 5B, 13Al Which is the most electropositive element among these?
Write down the electronic configuration of the following elements from the given atomic numbers. Answer the following question with an explanation.
13Al, 14Si, 11Na, 12Mg, 16S
Which of the above elements has the highest metallic character?
Write the scientific reason.
The third period contains only eight elements even though the electron capacity of the third shell is 18
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`
_______ is the outermost shell for elements of period 2.
Which pair of atomic numbers represents elements in the same group?
Write the name of an element having electronic configuration 2,8,2.
Match the columns.
| Column A | Column B |
| 1) Alkaline earth metals | a) Group 18 |
| 2) Alkali metals | b) Group 17 |
| 3) Halogen | c) Group 2 |
| 4) Noble gas | d) Group 1 |
| e) Group 14 |
The number of electrons in the outermost shell of an atom determines the _______.
Write the name.
Highest electropositive element
The valency of the elements in group 2 is 1.
The elements lithium and beryllium are in the same period because their valencies are similar.
The number of shells decreases in a group from top to bottom.
Distinguish between:
Group - Period
Observe the periodic table given below and write the answers of the questions.
- Write the name and valencies of the elements in 3rd row.
- Classify the elements in this row as metal, nonmetal and metalloids.
- Which block does nonmetals belong to?
- Write name of any two metalloid elements.
What is the electronic configuration of K19?
