Advertisements
Advertisements
Question
Define periods of modern periodic table.
Advertisements
Solution
The horizontal rows are called periods. The table consists of 7 periods, numbered from 1 to 7 from top to bottom.
APPEARS IN
RELATED QUESTIONS
Fill in the blank:
The modern periodic table consists of ……………. periods.
How does the electronic configuration of an atom relate to its position in the Modern Periodic Table?
Write the names given to the vertical columns and horizontal rows in the Modern Periodic Table. How does the metallic character of elements vary on moving down a vertical column? How does the size of atomic radius vary on moving left to right in a horizontal row? Give reason in support of your answer in the above two cases.
How were the positions of cobalt and nickel resolved in the modern periodic table?
What is the number of valence electrons in the atoms of first elements in a period?
Explain why all the elements of a period have different chemical properties.
What is the main characteristic of the last elements in the periods of the periodic table? What is the general name of such elements?
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)
Consider the following elements:
20Ca, 8O, 18Ar, 16S, 4Be, 2He
Which of the above elements would you expect to be:
(i) very stable?
(ii) in group 2 of the periodic table?
(iii) in group 16 of the periodic table?
Name two elements in Alkaline earth metals.
Name two elements in each case:
Transition element
How does the electronic configuration of an atom relate to its position in the modern periodic table?
The electronic configuration of an element T is 2, 8, 8, 1.
What is the group number of T?
State the main aim of classifying elements. Which is the more fundamental property of elements that is used in the development of Modern Periodic Table? Name and state the law based on this fundamental property. On which side of the periodic table one can find metals, non-metals and metalloids?
Give the symbol and valency of the following element and radical.
Nitrogen [Nitride]
Give the symbol and valency of the following element and radical.
Bisulphate
Give the symbol and valency of the following element and radical.
Carbonate
Give the chemical formula of sodium bicarbonate
Give the chemical formula of ammonium sulphate
Give the chemical formula of carbonic acid
State the number of elements in Period 2 of the Periodic Table.
What are the elements.
The groups 1 and 2 constitute the ______ block.
Write a scientific reason.
There was ambiguity about the correct position of hydrogen in Mendeleev’s periodic table.
An X element with atomic number 11 and Y element with atomic number 13 belongs to the third period in the modern periodic table. With this information, give the answers of the below questions.
- Which element has more metallic character from these two elements?
- What is the valency of each X and Y elements?
- Atom size of Y element is smaller than atom size of X element? Explain?
Elements in the modern periodic table are arranged in ______groups and______ periods.
Element ‘X’ forms a chloride with the formula XCl2, which is solid with a high melting point. X would most likely be in the same group of the periodic table as: ______
On moving from left to right in a period in the periodic table, the size of the atom ______
The longest period of the Modern Periodic Table is period.
Where would you locate the element with electronic configuration 2,8 in the Modern Periodic Table?
Which of the following is the outermost shell for elements of period 2?
Which one of the following elements exhibit maximum number of valence electrons?
Which of the following elements does not lose an electron easily?
Noble gases are placed in the ______ group in the modern periodic table.
The maximum number of electrons that can be accommodated in s, p,d, and f subshells are ______.
Spot the error:
The elements of group 13 are called the carbon family.
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 ______.
A group of elements in the periodic table is given below (Boron is the first member of the group and Thallium is the last).
Boron, Aluminium, Gallium, Indium, Thallium
Answer the following question in relation to the above group of elements:
If the electronic configuration of aluminium is 2, 8, 3, how many electrons are there in the outer shell of thallium?
