The elements A,B,C,D,and E have atomic number | vedclass

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(C) To determine the group of an element,we write its electronic configuration:$A$ (atomic number $9$): $2, 7$ (Group $17$,Halogens)$B$ (atomic number

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$A$ and $C$

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(C) To determine the group of an element,we write its electronic configuration:$A$ (atomic number $9$): $2, 7$ (Group $17$,Halogens)$B$ (atomic number $11$): $2, 8, 1$ (Group $1$,Alkali metals)$C$ (atomic number $17$): $2, 8, 7$ (Group $17$,Halogens)$D$ (atomic number $12$): $2, 8, 2$ (Group $2$,Alkaline earth metals)$E$ (atomic number $13$): $2, 8, 3$ (Group $13$)Elements belonging to the same group have the same number of valence electrons.$A$ and $C$ both have $7$ valence electrons,so they belong to the same group (Group $17$).

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

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

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The order of decreasing atomic size is:

Which of the following elements will form an acidic oxide?

Calcium is an element with atomic number $20$.$(i)$ Will it be a metal or a non-metal?$(ii)$ What will be its valency?$(iii)$ What would be the formula of its chloride?$(iv)$ Will it be larger or smaller than $K$ (Potassium)?

Which of the following elements will form an acidic oxide?

The atomic number of an element is $17$. Predict $(a)$ its valency,$(b)$ whether it is a metal or non-metal,$(c)$ its relative size with respect to other members of its group. Justify your answer in each case.

Vedclass Test Series

Exam Paper Generator

Online Exam Module

Calcium is an element with atomic number $20$.
$(i)$ Will it be a metal or a non-metal?
$(ii)$ What will be its valency?
$(iii)$ What would be the formula of its chloride?
$(iv)$ Will it be larger or smaller than $K$ (Potassium)?