Advertisements
Advertisements
प्रश्न
p-block is composed of groups 1 and 2.
पर्याय
Right
Wrong
Advertisements
उत्तर
p-block is composed of groups 1 and 2- Wrong
APPEARS IN
संबंधित प्रश्न
Name two elements you would expect to show chemical reactions similar to magnesium. What is the basis for your choice?
The position of three elements A, B and C in the Periodic Table are shown below –
|
Group 16
|
Group 17
|
|
−
|
−
|
|
−
|
A
|
|
−
|
−
|
|
B
|
C
|
(a) State whether A is a metal or non-metal.
(b) State whether C is more reactive or less reactive than A.
(c) Will C be larger or smaller in size than B?
(d) Which type of ion, cation or anion, will be formed by element A?
Fill in the following blank with suitable word:
The horizontal rows in a periodic table are called ...............
How many periods and groups are there in the long form of periodic table?
What is the significance of atomic number in the modern classification of elements? Explain with the help of an example.
On which side of the periodic table will you find metals?
The modern periodic table was prepared by ______.
What is the number of valence electrons in the atoms of first elements in a period?
What is the fundamental difference in the electron configurations between the group 1 and group 2 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?
In the modern Periodic Table, why does cobalt with higher atomic mass of 58.93 appear before nickel having lower atomic mass of 58.71?
What are the advantages of the periodic table?
An element X belongs to 3rd period and group 2 of the periodic table. State:
(a) number of valence electrons
(b) valency
(c) metal or non-metal
(d) name of the element
State the term
The tabular arrangement of elements in horizontal rows and vertical columns _________
What are horizontal rows and vertical columns in a periodic table known as?
Name two elements in Alkali metals.
Name two elements in each case:
Actinides
Name the type of elements which have outermost shell incomplete.
Name the type of elements which have two outermost shell incomplete.
Name the type of elements which have one electron short of octet.
Answer the following in respect of element `31/15 P `
To which group and period does it belong?
An element barium has the atomic number 56. Look up its position in the periodic table and answer the following question.
Is it larger or smaller than caesium (Cs)?
What is meant in the periodic table by a period?
Give the symbol and valency of the following element and radical.
Sodium
Give the symbol and valency of the following element and radical.
Sulphite
Give the chemical formula of calcium phosphate
The d-block elements are called as _______ elements.
Group 1 and 2 : s block : : group 13 and 18 : _______
______ is the longest period in the periodical table.
______ forms the basis of the modern periodic table.
The amount of energy released when one or more electrons is added to the neutral atom is ______
The inert gas which lies in the third period is ______
Which of the following elements would lose an electron easily?
Three elements A, B and C have 3, 4 and 2 electrons respectively in their outermost shell. Give the group number to which they belong in the Modern Periodic Table. Also, give their valencies.
An element X which is a yellow solid at room temperature shows catenation and allotropy. X forms two oxides which are also formed during the thermal decomposition of ferrous sulphate crystals and are the major air pollutants.
- Identify the element X
- Write the electronic configuration of X
- Write the balanced chemical equation for the thermal decomposition of ferrous sulphate crystals?
- What would be the nature (acidic/ basic) of oxides formed?
- Locate the position of the element 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
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 Metalloid?
Explain giving reason why although the nuclear charge in atoms increases in moving from left to right in a period as well as in moving from top to bottom in a group in the Modern periodic table, but the size of the atoms does not vary similarly in both situations.
