Advertisements
Advertisements
प्रश्न
Write scientific reason.
Lithium and sodium are included in the same group in periodic table.
Advertisements
उत्तर
- Electronic configuration of lithium is (2, 1). Electronic configuration of sodium is (2, 8, 1).
- Both lithium and sodium have single electron in their outermost shell.
- Their valency is 1.
- In the periodic table, elements belonging to the same group have the same valency. Hence, lithium and sodium are included in the same group in periodic table.
APPEARS IN
संबंधित प्रश्न
Why do all the elements of the same group have similar properties?
Fill in the following blank with suitable word:
The horizontal rows in a periodic table are called ...............
Consider the following elements:
Na, Ca, Al, K, Mg, Li
Which of these elements belong to the same group of the periodic table?
What is the fundamental difference in the electron configurations between the group 1 and group 2 elements?
What are the advantages of the periodic table?
What are the periods in a periodic table? Give two characteristics of each.
Give the group number of following elements present in periodic table
What are horizontal rows and vertical columns in a periodic table known as?
Correct the statement.
Copper and zinc are representative elements.
Name the type of elements which have outermost shell complete.
Name the type of elements which have two outermost shell incomplete.
State its position in the periodic table?
Fill in the blank:
The horizontal rows in the periodic table are called _____________.
Name an alkali metal in period 3 and halogen in period 2.
How does number of (i) valence electrons (ii) valency; vary on moving from left to right in the second period of a periodic table?
Name an element of group 18 which can form compounds.
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.
Bisulphite
Give the chemical formula of sodium nitrate
Fill in the blank:
The element lithium in the Modern Periodic Table with valency 1+ belongs to the group ______.
How were elements arranged in the long form of the periodic table or the Modern Periodic Table?
Group 13 to 18 : p block : : _______ : d block
To the left of the zig-zag line in the periodic table are the metal elements.
______ forms the basis of the modern periodic table.
The arrangement of elements in the Modem Periodic Table is based on their ______
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?
Compare the radii of two species X and Y. Give reasons for your answer.
- X has 12 protons and 12 electrons
- Y has 12 protons and 10 electrons
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.
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 variable valency and is a member of the Oxygen family (group 16).
______ group elements are called alkaline earth metals.
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:
E and B
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 Noble gas?
An element ‘M' has 50% of the electrons filled in the 3rd shell as in the 2nd shell. The atomic number of ‘M’ is ______.
State the group and period, of the element having three shells with three electrons in valence shell.
Answer the following in respect of element \[\ce{_16^32S}\].
Give its electronic configuration.
Answer the following in respect of element \[\ce{_16^32S}\].
Give its formula with hydrogen.
