Study the variation in the atomic radii of second group elements are given below and answer the question given. In this second period of elements which element has the smallest atomic size?

In this second period of elements fluorine (F) has the smallest atomic size. Fluorine is a chemical element with the atomic number 9. It is the lightest halogen and exists at standard conditions as a highly toxic, pale yellow diatomic gas. In general, the atomic radius decreases as we move from left to right in a period with an increase in the nuclear charge of the element.

Match the left column with the correct answers from the right column. Left Column Right Column Oxide layer protects from attack by water vapour (a) Cu Group 1 elements of the long periodic table having the least reducing property (b) Be When the metals remain exposed to air, green patches develop on its surface (c) Al Group 2 elements of the long periodic table having the least atomic radius (d) Li

Left Column Right Column Oxide layer protects from attack by water vapour (c) Aluminium Al Group 1 elements of the long periodic table having the least reducing property (d) Lithium Li When the metals remain exposed to air, green patches develop on its surface (a) Copper Cu Group 2 elements of the long periodic table having the least atomic radius (b) Beryllium Be

The position of elements A, B, and C in the Periodic Table are shown below. Group 16 Group 17 - - - - - A B C Will C be larger or smaller in size than B.

C will be smaller in size than B as moving across a period, the nuclear charge increases, and therefore electrons come closer to the nucleus. Atomic size gradually decreases from left to right across a period of elements.

The position of elements A, B, and C in the Periodic Table are shown below. Group 16 Group 17 - - - - - A B C State whether A is a metal or non-metal.

The element A is non-metal. This is because it belongs to group 17 , and has seven electrons in its outermost shell. So, it has a tendency to gain electrons to attain a stable noble gas configuration. Generally, non-metals are electron acceptors.

Study the variation in the atomic radii of second group elements are given below and answer the question given. In the second period which element has the highest metallic characteristics?

In the second period lithium has the highest metallic character. Li, lithium is a chemical element with an atomic number 3 . It is a soft, silvery-white alkali metal. The effective nuclear charge acting on the valence shell electrons increases across a period, the tendency to lose electrons will decrease. Hence, the metallic character decreases across a period.

Which halogen has the largest atomic radius

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Science>Chemistry>Periodic Classification of Elements>Periodic trends in the modern periodic table

The atomic numbers of five elements A, B, C, D and E are $6, 8, 3, 7$ and $9$ respectively.

(i) Which is the element having the highest electropositivity among these elements? Why?

(ii) Which is the element having the least metallic character among these elements? Why?

(iii) What is your conclusion about the relationship between metallic character and electropositivity of an element?

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Science>Chemistry>Periodic Classification of Elements>Periodic trends in the modern periodic table

Which of the following is not a correct statement about the trends when going from left to right across the periods of the Periodic Table?

HARD

Science>Chemistry>Periodic Classification of Elements>Periodic trends in the modern periodic table

How does the atomic size vary in groups and periods in the modern periodic table? Why?

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Science>Chemistry>Periodic Classification of Elements>Periodic trends in the modern periodic table

Study the variation in the atomic radii of second group elements are given below and answer the question given.

Question Image

In this second period of elements which element has the smallest atomic size?

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Science>Chemistry>Periodic Classification of Elements>Periodic trends in the modern periodic table

An element

X

forms a chloride with the formula

{XCl}_{2}

, which is solid with a high melting point.

X

would most likely to be in the same group of the Periodic Table as

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Science>Chemistry>Periodic Classification of Elements>Periodic trends in the modern periodic table

How does metallic character change in a group of Modern Periodic Table ongoing top to bottom?

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Science>Chemistry>Periodic Classification of Elements>Periodic trends in the modern periodic table

Sodium [Na] and sulphur [S] both are present in third period of modern periodic table. Which is more metallic and why?

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Science>Chemistry>Periodic Classification of Elements>Periodic trends in the modern periodic table

Match the left column with the correct answers from the right column.

Left Column	Right Column
Oxide layer protects from attack by water vapour	(a) $Cu$
Group $1$ elements of the long periodic table having the least reducing property	(b) $Be$
When the metals remain exposed to air, green patches develop on its surface	(c) $Al$
Group $2$ elements of the long periodic table having the least atomic radius	(d) $Li$

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Science>Chemistry>Periodic Classification of Elements>Periodic trends in the modern periodic table

The position of elements A, B, and C in the Periodic Table are shown below.

Group 16	Group 17
-	-
-	-
-	A
B	C

Will C be larger or smaller in size than B.

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Science>Chemistry>Periodic Classification of Elements>Periodic trends in the modern periodic table

The position of elements A, B, and C in the Periodic Table are shown below.

Group 16	Group 17
-	-
-	-
-	A
B	C

State whether A is a metal or non-metal.

MEDIUM

Science>Chemistry>Periodic Classification of Elements>Periodic trends in the modern periodic table

Study the variation in the atomic radii of second group elements are given below and answer the question given.

Question Image

In the second period which element has the highest metallic characteristics?

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Science>Chemistry>Periodic Classification of Elements>Periodic trends in the modern periodic table

Define atomic size. Give its unit of measurement. In the modern periodic table what trend is observed in the atomic radius in a group and a period, and why is it so?

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Science>Chemistry>Periodic Classification of Elements>Periodic trends in the modern periodic table

${CaH}_{2}, NaH, {SiH}_{4}, {AlH}_{3}$

Give valencies of $Ca, Ni, Si, Al$ in the above compounds.

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Science>Chemistry>Periodic Classification of Elements>Periodic trends in the modern periodic table

How does atomic size change in a group of Modern Periodic Table on going from top to bottom?

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Science>Chemistry>Periodic Classification of Elements>Periodic trends in the modern periodic table

11, 12, 13, and 14 are the atomic numbers of the elements Na, Mg, Al, and Si respectively. Which element has more atomic radius?

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Science>Chemistry>Periodic Classification of Elements>Periodic trends in the modern periodic table

The following table shows the position of six elements A, B, C, D, E, and F.in the modern periodic table:

Question Image

Which element is a non-metal with valency 3?

MEDIUM

Science>Chemistry>Periodic Classification of Elements>Periodic trends in the modern periodic table

The following table shows the position of six elements A, B, C, D, E, and F.in the modern periodic table:

Question Image

Which element is a metal with valency 2?

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Science>Chemistry>Periodic Classification of Elements>Periodic trends in the modern periodic table

What are semimetals? Name any two semimetals.

HARD

Science>Chemistry>Periodic Classification of Elements>Periodic trends in the modern periodic table

How does the valency of an element change (i) on moving down a group and (ii) on moving from left to right in a period?

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Science>Chemistry>Periodic Classification of Elements>Periodic trends in the modern periodic table

How does the metallic character of elements vary on moving from left to right in a period? Give a reason for your answer.

Which halogen has the largest atomic radius?

Important Questions on Periodic Classification of Elements

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