Advertisements
Advertisements
प्रश्न
Write an explanation.
Period
Advertisements
उत्तर
A period is a horizontal row in the periodic table where elements have the same number of electron shells and show a gradual change in properties across the row.
APPEARS IN
संबंधित प्रश्न
In the Modern Periodic Table, which are the metals among the first ten elements?
Compare and contrast the arrangement of elements in Mendeleev’s periodic Table and the Modern Periodic Table.
What is periodicity in properties of elements with reference to the Modern Periodic Table?
State modern periodic law.
How were the positions of cobalt and nickel resolved in the modern periodic table?
On which side of the periodic table will you find metals?
Which of the following statement is correct in regard to the classification of elements?
(a) Elements in modern periodic table are arranged on the basis of increasing atomic masses.
(b) Elements in Mendeleev's periodic table are arranged on the basis of increasing atomic numbers.
(c) In modern periodic table, the element nickel of lower atomic mass is kept before the element cobalt of higher atomic mass.
(d) In modern periodic table, the isotopes of chlorine having different atomic masses are kept in the same group.
How does the chemical reactivity of alkali metals vary on going in group 1 of the periodic table?
Explain why all the elements of a period have different chemical properties.
What is the fundamental difference in the electron configurations between the group 1 and group 2 elements?
On the basis of electronic configuration, how will you identify chemically similar elements?
In what respects do the properties of group 1 elements differ from those of group 17 elements? Explain with examples by taking one element from each group.
Which of the following are the correct characteristics of isotopes of an element?
(i) same atomic mass
(ii) same atomic number
(iii) same physical properties
(iv) same chemical properties
(a) (i), (ii) and (iv)
(b) (ii), (iii) and (iv)
(c) (ii) and (iii)
(d) (ii) and (iv)
State the term
The tabular arrangement of elements in horizontal rows and vertical columns _________
How many groups and periods does the modern periodic table have?
Correct the statement.
Copper and zinc are representative elements.
Fill in the blank:
The horizontal rows in the periodic table are called _____________.
Give the symbol and valency of the following element and radical.
Zinc
Give the symbol and valency of the following element and radical.
Chlorine [Chloride]
Give the symbol and valency of the following element and radical.
Bisulphate
Give the chemical formula of magnesium nitrate
State the number of elements in Period 3 of the Periodic Table.
Find the correlation:
Group 13 to 18 : p block : : ______ : d block
Answer the following question in one sentence.
The modern periodic table is divided into which blocks?
State whether true or false. If false, correct the statement.
Lanthanides and actinides are kept at the bottom of the periodic table because they resemble each other but they do not resemble with any other group elements.
______ forms the basis of the modern periodic table.
______ and ______ are called inner transition elements.
The element which has the least tendency to lose electrons is ______
Which of the following elements does not lose an electron easily?
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.
Noble gases are placed in the ______ group in the modern periodic table.
Group 16 elements are collectively called as ______.
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
Define periods of modern periodic table.
An element with atomic number ______ will form a basic oxide.
An element ‘M' has 50% of the electrons filled in the 3rd shell as in the 2nd shell. The atomic number of ‘M’ is ______.
Select the appropriate options and complete the following paragraph:
(metals, non-metals, metalloids, four, seven, s-block, p-block, d-block, f-block).
On the basis of electronic configuration, elements in the modern periodic table are classified Into ______ blocks. Groups 1 and 2 elements are included in ______ and all these elements are metals. (except Hydrogen). Group 13 to 18 elements are included in ______. This block contains metals, non-metals and metalloids. Group 3 to 12 elements are included in ______ and all the elements are ______ elements shown at the bottom of the periodic table i.e. Lanthanides and Actinides constitute ______ and all these elements are metals.
