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Question
An element belongs to the third period and Group IIIA (13) of the periodic table. State: the valency,
Solution
The valency is +3.
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RELATED QUESTIONS
Two elements ‘P’ and ‘Q’ belong to the same period of the modern periodic table and are in Group 1 and Group 2, respectively. Compare their following characteristics in tabular form:-
(a) The number of electrons in their atoms
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(f) The formula of their chlorides
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| Element | w | x | y | z |
| Electronic configurations |
2, 8, 1 | 2, 8, 7 | 2, 5 | 1 |
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2) What is the formula of the compound formed between :
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Give examples in support of your answer.
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An element X belong to 3rd periods and group II of the periodic table state:
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Four elements P, Q, R and S belong to the third period of the Modern Periodic Table and have respectively 1, 3, 5 and 7 electrons in their outermost shells. Write the electronic configurations of Q and R and determine their valences. Write the molecular formula of the compound formed when P and S combine.
Calculate the valency of element X whose atomic number is 9.
Parts (i) to (v) refer to changes in the properties of elements on moving from left to right across a period of the periodic table. For each property, choose the letter corresponding to the correct answer from the choices (a), (b), (c) and (d).
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An element A has 2 electrons in its fourth shell. State:
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