Advertisements
Advertisements
Question
Find the correlation:
Mendeleev’s periodic table : atomic mass : : Modern periodic table : _______
Advertisements
Solution
Mendeleev’s periodic table : atomic mass : : Modern periodic table : atomic number
Explanation:
Mendeleev organised his periodic table based on the atomic mass of elements. In contrast, the modern periodic table is based on the atomic number (the number of protons), which Henry Moseley demonstrated to be a more fundamental property for predicting periodic trends in chemical behaviour.
APPEARS IN
RELATED QUESTIONS
Name two elements you would expect to show chemical reactions similar to magnesium. What is the basis for your choice?
Compare and contrast the arrangement of elements in Mendeleev’s periodic Table and the Modern Periodic Table.
What is meant by a group, in a periodic table?
Explain why, the noble gases are placed in a separate group.
How does the chemical reactivity of the halogens vary on going in group 17 of the periodic table?
What is the major characteristic of the first elements in the periods of the periodic table? What is the general name of such elements?
How do the atomic radii of elements change as we go from left to right in a period of the periodic table?
State how the valency of elements varies in a period of the periodic table?
(b) What is the number of elements is 3rd period, the modern periodic table?
Helium and neon are unreactive gases. What, if anything, do their atoms have in common?
Define:
Periodic table
Name two elements in Alkaline earth metals.
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?
The electronic configuration of an element T is 2, 8, 8, 1.
What is the group number of T?
What is the number of elements in the 3rd period, of the modern periodic table?
Name an element of group 18 which can form compounds.
Give the symbol and valency of the following element and radical.
Nitrate
Give the symbol and valency of the following element and radical.
Bisulphite
Give the chemical formula of sodium sulphite
Give the chemical formula of calcium phosphate
State the number of elements in Period 2 of the Periodic Table.
What are the elements.
What are the periods in a periodic table?
To the left of the zig-zag line in the periodic table are the metal elements.
The K and L shells of the elements Na and Mg contain electrons.
Complete the following flow chart.
Noble gases belong to______ group of the periodic table.
Identify gas A in the following experiment.
The element with atomic number 14 is hard and forms acidic oxide and a covalent halide. To which of the following categories does the element belong?
Define periods of modern periodic table.
Define groups of modern periodic table.
Name two elements that you would expect to show chemical reactions similar to calcium. What is the basis of your choice?
An element has 2 electrons in its N shell.
State its position in periodic table.
An element has 2 electrons in its N shell.
Is it a metal or a non-metal?
Answer the following in respect of element \[\ce{_16^32S}\].
Give its formula with hydrogen.
