Advertisements
Advertisements
Question
How were the positions of isotopes of an element decided in the modern periodic table?
Solution
The isotopes of elements are not given a separate place in the periodic table. This is because isotopes have the same atomic number and a different atomic mass, and the modern periodic table is based on the atomic number of elements. Hence, to give it a separate place, the elements should be arranged according to their atomic mass.
APPEARS IN
RELATED QUESTIONS
The modern periodic table was prepared by ______.
State whether the following statement is true or false:
On going down in a group of the periodic table, the number of valence electrons increases.
Answer the following question.
Define the atomic size. Give its unit of measurement. In the modern periodic table what trend is observed in the atomic radius in a group and a period and why is it so?
Give the symbol and valency of the following element and radical.
Bisulphate
Write an Explanation.
Period
Complete the following flow chart.
Distinguish between:
s-block - p-block
______ forms the basis of the modern periodic table.
Answer the following in respect of element \[\ce{_16^32S}\].
Give its formula with hydrogen.
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?
