ICSE chemistry
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A group of the element is the Periodic table are 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 of element;
i) Which element has the most metallic character?
ii) Which element would be expected to have the highest electronegativity? :
iii) If the electronic configuration of Aluminium is 2,8,3 how many electrons are there in the outer shell of Thallium?
iv) The atomic number of Boron is 5. Write the chemical formula of the compound formed when Boron react with chlorine.
v) Will the elements in the group to the right to this Boron group be more metallic or less metallic in character? Justify your answer
i) Thallium
ii) Boron
iii) 3 electron are present in the outermost shell.
iv) BCl3
v) Less metallic. Because on moving towards the right in periodic table metallic characters decreases.
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Name the charged particles which attract one another to form electrovalent compounds.
Charged particles ;anions and cations forms electrovalent compounds.
In the formation of electrovalent compounds, electrons are transferred from one element to another. How are electrons involved in the formation of a covalent compound?
Electrons are shared to form a covalent compound.
The electronic configuration of nitrogen is 2,5 how many electrons in the outer shell of a nitrogen atom are not involved in the formation of nitrogen molecules?
Two electrons of nitrogen not used in the formation of nitrogen molecules.
In the formation of magnesium chloride (by the direct combination of magnesium and chlorine), name the substance that is oxidised and the substance that is reduced
Magnesium is oxidised chlorine is reduced
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Mock Test Series
Mock Test Series