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प्रश्न
Write the name.
Two elements having two orbits.
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उत्तर
Carbon (C), oxygen (O)
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संबंधित प्रश्न
Arrange the following as per the instruction given in the bracket.
Cs, Na, Li, K, Rb (increasing order of metallic character).
Name the periodic property which relates to the character of element which loses one or more electrons when supplied with energy.
An element barium has atomic number 56. Look up its position in the periodic table and answer the following question.
- Is it a metal or a non-metal?
- Is it more or less reactive than calcium?
- What is its valency?
- What will be the formula of its phosphate?
- is it larger or smaller than caesium (Cs) in size?
An element X belong to 3rd periods and group II of the periodic table state:
whether it is a metal or a non-metal.
The elements at the bottom of a group would be expected to show ______ metallic character than the element at the top.
Choose the correct answer.
An alkaline earth metal
(i) Lead
(ii) potassium
(iii) calcium
(iv) Copper
iii) Observe the figure and answer the following questions.
a) Identify the block shown by box A and write an electronic configuration of any one element of this block.
b) Identify the block of element denoted by letter B and write its period number.
Study the extract of the Periodic Table given below and answer the questions that follow. Give the alphabet corresponding to the element in question. DO NOT repeat an element. 
Which non-metallic element has the valency of 2?
State whether the following statement is true or false
All members of zero group are non metals.
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 questions in relation to the above group of elements:
- Which element has the most metallic character?
- Which element would be expected to have the highest electronegativity?
- If the electronic configuration of aluminium is 2, 8, 3, how many electrons will be there in the outermost shell of thallium?
- The atomic number of boron is 5. Write the chemical formula of the compound formed when boron reacts with chlorine.
- Will the elements in the group to the right of this boron group be more metallic or less metallic in character? Justify your answer.
Match the atomic number with the following:
A metal of valency one.
Arrange the following elements in order of their decreasing metallic character.
Na, Si, Cl, Mg, Al
Write the name.
The atom having the smallest atomic radius from zero group.
On moving down the group metallic character increases.
Electronegativity is the metallic property of an element.
Write scientific reason.
The metallic character of elements increases while going down the groups.
3, 1, 2 electrons are in valence shells of X, Y, Z elements resp. From this information, write the name of the groups it belongs to and its valency.
Three elements B, Si and Ge are
Which of the following metal (s) do not react with water?
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:
Will the elements in the group to the right of this boron group be more metallic or less metallic in character? Justify your answer.
