Advertisements
Advertisements
Questions
How many rows and columns are there in the modern periodic table?
Write the number of periods and groups in the modern periodic table.
Answer the following sub-question regarding the modern periodic table:
Write the number of periods and groups.
Advertisements
Solution
In the modern periodic table, there are 18 vertical columns known as groups and 7 horizontal rows known as periods.
APPEARS IN
RELATED QUESTIONS
In the Modern Periodic Table, calcium (atomic number 20) is surrounded by elements with atomic numbers 12, 19, 21, and 38. Which of these have physical and chemical properties resembling calcium?
Fill in the following blank with suitable word:
Group 17 elements are known as ...............
How many periods and groups are there in the long form of periodic table?
How were the positions of isotopes of an element decided in the modern periodic table?
How would the tendency to lose electrons change as we go from left to right across a period of the periodic table?
State whether the following statement is true or false:
On going down in a group of the periodic table, the number of valence electrons increases.
On the basis of electronic configuration, how will you identify chemically similar elements?
What is the main characteristic of the last elements in the periods of the periodic table? What is the general name of such elements?
What are the advantages of the periodic table?
What are horizontal rows and vertical columns in a periodic table known as?
Name two elements in each case:
Actinides
Name the metals in the first twenty elements.
Name the type of elements which have one electron short of octet.
Name the type of elements which have two electrons in the outermost orbit.
Answer the following in respect of element `31/15 P `
To which group and period does it belong?
Answer the following in respect of element `31/15 P`
Give its electronic configuration
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?
An element E has following electronic configuration:
|
K |
L |
M |
|
2 |
8 |
6 |
(a) To which group of the periodic table does element E belong?
(b) To which period of the periodic table does element E belong?
(c) State the number of valence electrons present in element E.
(d) State the valency of the element E.
The horizontal rows in a periodic table are called _____.
Name the cation and the anion in the salt – calcium sulphate
Give the symbol and valency of the following element and radical.
Magnesium
Give the symbol and valency of the following element and radical.
Ammonium
Give the symbol and valency of the following element and radical.
Bicarbonate
Give the symbol and valency of the following element and radical.
Sulphite
Give the chemical formula of calcium phosphate
Compare Modern Periodic Law with Mendeleev's Periodic Law.
The d-block elements are called as ______ elements.
Find the correlation:
Group 1 and 2 : s block : : group 13 and 18 : ______
p-block is composed of groups 1 and 2.
Write a scientific reason.
Lithium and sodium are included in the same group in the periodic table.
What are groups and periods in the modern periodic table?
How does the property vary in periods and in groups?
Which of these belong to the same period?
| Element | A | B | C |
| Atomic number | 2 | 10 | 5 |
On moving from left to right in a period in the periodic table, the size of the atom ______
Which one of the following elements exhibit maximum number of valence electrons?
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
Match the atomic number with the following:
A rare gas.
