(B) Elements $B$ and $C$ belong to the same group (Group $2$) because they both have $2$ valence electrons in their outermost shell. $B$ is Beryllium

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(B) Elements $B$ and $C$ belong to the same group (Group $2$) because they both have $2$ valence electrons in their outermost shell. $B$ is Beryllium $(Be)$ and $C$ is Magnesium $(Mg)$.$(b)$ Elements $A$ and $B$ belong to the same period (Period $2$) because they both have $2$ shells. $A$ is Lithium $(Li)$ and $B$ is Beryllium $(Be)$.$(c)$ Element $D$ is inert because its outermost shell is completely filled (it is Helium $(He)$).

Class 10 Science Periodic Classification of Elements Mix Examples - Periodic Classification of Elements

The electronic configurations of $4$ elements $A, B, C,$ and $D$ are as follows:
$A: 2, 1$
$B: 2, 2$
$C: 2, 8, 2$
$D: 2$
$(a)$ Which of these elements belong to the same group? Name them.
$(b)$ Which of these elements belong to the same period? Name them.
$(c)$ Which of these elements is inert? Name it.

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Periodic Classification of Elements

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Mix Examples - Periodic Classification of Elements

The three elements $A$,$B$,and $C$ with similar properties have atomic masses $X$,$Y$,and $Z$ respectively. The mass of $Y$ is approximately equal to the average mass of $X$ and $Z$. What is such an arrangement of elements called? Give one example of such a set of elements.

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Write true or false for the statement: In order to fit elements into his table,Newlands adjusted three elements in the same slot,but also put some unlike elements in the same slot.

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Where would you locate the element with electronic configuration $2, 8$ in the Modern Periodic Table?

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Name the following:
$(a)$ $A$ metal that can be cut with a knife.
$(b)$ $A$ metal that is liquid at room temperature.
$(c)$ $A$ metal that has $3$ valence electrons.

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The atomic numbers of three elements $A, B$,and $C$ are $12, 18$,and $20$ respectively. State,giving reason,which two elements will show similar properties.

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The electronic configurations of $4$ elements $A, B, C,$ and $D$ are as follows:$A: 2, 1$$B: 2, 2$$C: 2, 8, 2$$D: 2$$(a)$ Which of these elements belong to the same group? Name them.$(b)$ Which of these elements belong to the same period? Name them.$(c)$ Which of these elements is inert? Name it.

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The three elements $A$,$B$,and $C$ with similar properties have atomic masses $X$,$Y$,and $Z$ respectively. The mass of $Y$ is approximately equal to the average mass of $X$ and $Z$. What is such an arrangement of elements called? Give one example of such a set of elements.

Write true or false for the statement: In order to fit elements into his table,Newlands adjusted three elements in the same slot,but also put some unlike elements in the same slot.

Where would you locate the element with electronic configuration $2, 8$ in the Modern Periodic Table?

Name the following:$(a)$ $A$ metal that can be cut with a knife.$(b)$ $A$ metal that is liquid at room temperature.$(c)$ $A$ metal that has $3$ valence electrons.

The atomic numbers of three elements $A, B$,and $C$ are $12, 18$,and $20$ respectively. State,giving reason,which two elements will show similar properties.

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Name the following:
$(a)$ $A$ metal that can be cut with a knife.
$(b)$ $A$ metal that is liquid at room temperature.
$(c)$ $A$ metal that has $3$ valence electrons.