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प्रश्न
An element barium has the atomic number 56. Look up its position in the periodic table and answer the following question.
Is it larger or smaller than caesium (Cs)?
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उत्तर
As we move from left to right in a period, the size decreases, therefore, it will be smaller than Cesium.
संबंधित प्रश्न
Which of the following statement about the modern periodic table is correct?
(a) It has 18 horizontal rows known as periods.
(b) It has 7 vertical columns known as periods.
(c) It has 18 vertical columns known as groups.
(d) It has 7 horizontal rows known as groups.
What is the major characteristic of the first elements in the periods of the periodic table? What is the general name of such elements?
What is a period in a periodic table?
Name the type of elements which have two outermost shell incomplete.
Give the symbol and valency of the following element and radical.
Bisulphate
Give the chemical formula of carbonic acid
Fill in the blank:
The element lithium in the Modern Periodic Table with valency 1+ belongs to the group ______.
Identify gas A in the following experiment.
Three elements A, B and C have 3, 4 and 2 electrons respectively in their outermost shell. Give the group number to which they belong in the Modern Periodic Table. Also, give their valencies.
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.
