Advertisements
Advertisements
Question
The groups 1 and 2 constitute the ______ block.
Options
s
p
d
d
Advertisements
Solution
The groups 1 and 2 constitute the s block.
Explanation:
The Modern Periodic Table is divided into blocks based on which orbital the valence electrons enter. Groups 1 and 2 are called the s-block because their outermost electrons enter the $ns$ orbital.
APPEARS IN
RELATED QUESTIONS
How were the positions of isotopes of an element decided in the modern periodic table?
How were the positions of cobalt and nickel resolved in the modern periodic table?
The atomic numbers of four elements P, Q, R and S are 6, 8, 14 and 16 respectively. Out of these, the element known as metalloid is:
(a) P
(b) Q
(c) R
(d) S
State how the valency of elements varies in a group of the periodic table?
On the basis of electronic configuration, how will you identify chemically similar elements?
Explain why, the first period of the periodic table has only two elements whereas second period has eight elements
What is the number of elements is 1st period the modern periodic table?
(b) What is the number of elements is 3rd period, the modern periodic table?
What are the periods in a periodic table? Give two characteristics of each.
Define:
Periodic table
State the term
The tabular arrangement of elements in horizontal rows and vertical columns _________
Name the scientist who stated the modern periodic law.
Correct the statement.
Copper and zinc are representative elements.
Name two elements in Alkali metals.
Name two elements in Inert gas.
Name two elements in each case: Lanthanides
Name the type of elements which have two electrons in the outermost orbit.
An element barium has atomic number 56. Look up its position in the periodic table and answer the following question.
What will be the formula of its phosphate?
Name and state the following with reference to the elements of the first three periods of the periodic table.
A covalent compound formed by an element in period 2 and a halogen.
Name an element of group 18 which can form compounds.
Give the symbol and valency of the following element and radical.
Potassium
Give the symbol and valency of the following element and radical.
Hydrogen
What are the elements.
Compare Modern Periodic Law with Mendeleev's Periodic Law.
Find the correlation:
Mendeleev’s periodic table : atomic mass : : Modern periodic table : _______
Right or wrong sentence.
The modern periodic table has 1 to 7 periods.
Right or wrong sentence.
The modern periodic table shows the molecular masses of the elements in each frame.
In the modern periodic table, elements are arranged according to their ______
Which of the following elements does not lose an electron easily?
If an element X is placed in group 14, what will be the formula and the nature of bonding of its chloride?
Group 16 elements are collectively called as ______.
Spot the error:
The elements of group 13 are called the carbon family.
Spot the error:
There are 5 periods and 17 groups in the modern periodic table.
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
An element belonging to 3d series of modern periodic table has spin magnetic moment = 5.92 B.M. in +3 oxidation state. The atomic number of elements are ______.
Name the metalloids in the first twenty elements.
Name the following metal:
A metal present in period 3, group 1 of the periodic table.
An element has 2 electrons in its N shell.
State its position in periodic table.
