Advertisements
Advertisements
प्रश्न
Right or wrong sentence.
The modern periodic table has 1 to 7 periods.
पर्याय
Right
Wrong
Advertisements
उत्तर
The given sentence is wrong.
Explanation:
The modern periodic table has seven periods. The horizontal rows are called periods; the lanthanide and actinide rows are often shown separately but belong to periods 6 and 7.
APPEARS IN
संबंधित प्रश्न
How does the electronic configuration of an atom relate to its position in the Modern Periodic Table?
Why do all the elements of the same group have similar properties?
What is meant by a group, in a periodic table?
Name the scientist who prepared modern periodic table.
Consider the following elements:
Na, Ca, Al, K, Mg, Li
Which of these elements belong to the same group of the periodic table?
How would the tendency to lose electrons change as we go from left to right across a period of the periodic table?
What is the usual number of valence electrons in the atoms of the last element in a period?
From the standpoint of atomic structure, what determines which element will be the first and which the last in a period the periodic table?
The atomic numbers of the three elements X, Y and Z are 2, 6 and 10 respectively.
(i) Which two elements belong to the same group?
(ii) Which two elements belong to the same period?
Give reasons for your choice.
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 the metals in the first twenty elements.
Name the type of elements which have two outermost shell incomplete.
Write the number of protons, neutrons and electronic configuration of \[\ce{_19^39K, _15^31P}\]. Also state their position in periodic table.
State the modern periodic law.
Name an element of group 18 which can form compounds.
Answer the following question.
How it can be proved that the basic structure of the Modern Periodic Table is based on the electronic configuration of atoms of different elements?
Give the symbol and valency of the following element and radical.
Sodium
Give the symbol and valency of the following element and radical.
Sulphur [Sulphide]
Give the symbol and valency of the following element and radical.
Bisulphate
Give the chemical formula of magnesium nitrate
Fill in the blank:
The element lithium in the Modern Periodic Table with valency 1+ belongs to the group ______.
State the number of elements in Period 3 of the Periodic Table.
Find the odd one out and give its explanation.
Right or wrong sentence.
The K and L shells of the elements Na and Mg contain electrons.
Complete the following flow chart.
Distinguish between:
s-block - p-block
Distinguish between:
Group 17 - Group 18
Identify gas A in the following experiment.
On moving from left to right in a period in the periodic table, the size of the atom ______
The inert gas which lies in the third period is ______
An element which is an essential constituent of all organic compounds belongs to
Choose an element from period 3 of modern periodic table that matches the description given below in instance. Give a reason for your choice.
It has variable valency and is a member of the Oxygen family (group 16).
Noble gases are placed in the ______ group in the modern periodic table.
Explain the position of hydrogen in the periodic table.
Give the criteria on the basis of which elements are placed (i) in a group and (ii) in a period in the modern periodic table. The atomic number of an element is 16. According to the criteria, in which group and period it should be placed?
Answer the following in respect of element \[\ce{_16^32S}\].
Give its formula with hydrogen.
