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Position of A, B and C three elements is given in the table from the modern periodic table. Answer the following questions - Science and Technology 1

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प्रश्न

Position of A, B and C three elements is given in the table from the modern periodic table. Answer the following questions.

Periods Group 2 Group 17
2 ----- A
3 B -----
4 ----- C
  1. What is A element metal or nonmetal?
  2. Which is the outermost orbit of element B?
  3. Identify C element and it's physical state.
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उत्तर

  1. Element is A is Non-metal.
  2. Outermost shell of element B is M.
  3. Element C is bromine (Br) and it exists in a liquid state.
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अध्याय 2: Periodic Classication of Element - Answer the Following

वीडियो ट्यूटोरियलVIEW ALL [3]

संबंधित प्रश्न

Name two elements you would expect to show chemical reactions similar to magnesium. What is the basis for your choice?


Why do all the elements of the same group have similar properties?


How were the positions of cobalt and nickel resolved in the modern periodic table?


What is the name of those elements which divide metals and non-metals in the periodic table?


Explain why, the noble gases are placed in a separate group.


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 are the periods in a periodic table? Give two characteristics of each.


Name two elements in Inert gas.


Name the type of elements which have two outermost shell incomplete.


Name the type of elements which have two electrons in the outermost orbit.


Answer the following in respect of element `31/15 P`

Give its electronic configuration


Name an alkali metal in period 3 and halogen in period 2.


Write a short note.

Structure of the modern periodic table.


Write a short note.

Position of isotopes in the Mendeleev’s and the modern periodic table.


What is the number of elements in the 3rd period, of the modern periodic table?


Name and state the following with reference to the elements of the first three periods of the periodic table.

A covalent compound formed by an element in period 2 and a halogen.


Give the symbol and valency of the following element and radical.

Potassium


Give the symbol and valency of the following element and radical.

Sulphate


Give the chemical formula of sodium bicarbonate


Give the chemical formula of calcium phosphate


State what the group number in the Modern Periodic Table signifies. Give a reason why elements in the same group, have similar valency and similar chemical properties.


State the number of elements in Period 2 of the Periodic Table.


The groups 1 and 2 constitute the _______ block.


Mendeleev's periodic table : atomic mass : : Modern periodic table : _______


The modern periodic table is divided into which blocks?


The K and L shells of the elements Na and Mg contain electrons.


______ is the longest period in the periodical table.


The amount of energy released when one or more electrons is added to the neutral atom is ______ 


The elements A, B, C, D and E have atomic number 9, 11, 17, 12 and 13 respectively. Which pair of elements belong to the same group?


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.

  1. Identify the element X
  2. Write the electronic configuration of X
  3. Write the balanced chemical equation for the thermal decomposition of ferrous sulphate crystals?
  4. What would be the nature (acidic/ basic) of oxides formed?
  5. Locate the position of the element in the Modern Periodic Table.

______ group elements are called alkaline earth metals.


A part of modern periodic table is given below. On its basis, answer the following questions:

Group No. → 1 2 13 14 15 16 17 18
Period ↓
2   A       B    
3 E     D     F C

Which of the element is a Noble gas?


An element with atomic number ______ will form a basic oxide.


Name the following metal:

A metal present in period 3, group 1 of the periodic table.


Answer the following in respect of element \[\ce{_16^32S}\].

Give its electronic configuration.


Answer the following in respect of element \[\ce{_16^32S}\].

Give its formula with hydrogen.


Match the atomic number with the following:

An element of group 2.


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