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Chemistry ICSE X > Periodic Properties and Variation in Properties > Flashcards

Periodic Properties and Variation in Properties Flashcards

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1
Q

State the number of elements in Period 1, Period 2 and Period 3 of the Periodic Table.

A

There are 2 elements in Period 1 and 8 elements in each of Period 2 and Period 3.

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2
Q

Name the elements in Period 1.

A

Hydrogen and Helium.

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3
Q

What happens to atomic size of elements on moving from left to right in a period?

A

The atomic size of elements on moving from left to right in a period decreases.

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4
Q

What is the common feature of the electronic configuration of the elements at the end of Period 2 and Period 3?

A

The atoms of the elements at the end of Period 2 and Period 3 has 8 electrons in their outermost shell.

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5
Q

If an element is in group 7 (or group 7A), is it likely to be metallic or non- metallic in character?

A

Non-metallic.

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6
Q

If an element has one electron in its outermost energy level, then it is likely to be ________ (metallic/non-metallic).

A

Metallic

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7
Q

The properties of the elements are a periodic function of their ___________ (atomic number, mass number, relative atomic mass)

A
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8
Q

Moving across a ___________ of the Periodic Table, the elements show increasing ___________ character (group, period, metallic, non-metallic)

A

period, non-metallic

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9
Q

The elements at the bottom of a group would be expected to show __________ metallic character than the element at the top (less, more)

A

more

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10
Q

What is meant by a Group in the Periodic Table?

A

The vertical column in a periodic table are called group.

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11
Q

The similarities in the properties of a group of elements is because they have the same __________ (atomic number, electronic configuration, number outer electrons).

A

number of outer electrons

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12
Q

Within a group where would you expect to find the element with:
(a) the greatest metallic character? (b) the largest atomic size?

A

(a) At the bottom of the group. (b) At the bottom of the group.

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13
Q

State whether the ionization potential increases or decreases on going down a Group.

A

Decreases

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14
Q

How many elements are there in Period 2?

A

Eight

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15
Q

Write the formula of the sulphate of the element with atomic number 13.

A

Al2(SO4)3

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16
Q

What type of bonding will be present in the oxide of the element with atomic number 1?

A

Covalent

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17
Q

Which features of the atomic structure accounts for the similarities in the chemical properties of the elements in group 7A of the periodic table?

A

All the elements of the group 7A contain 7 valence electrons in their outermost shell. All of them require one electron to complete their octet.

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18
Q

Name the elements which has the highest ionization potential.

A

Helium

19
Q

How many electrons are present in the valency shell of the element with the atomic number 18?

A

8 electron

20
Q

What is the name given to the energy released when an atom in its isolated gaseous state accepts an electron to form an anion?

A

Electron affinity

21
Q

What is the electronic configuration of the element in the third period which gains one electron to change into an anion?

A

2, 8, 8

22
Q

The atomic size ________ as we move from left to right across the period, because the __________ increases but the __________ remains the same.

A

decreases, nuclear charge, number of shells

23
Q

The electro-negativities (according to Pauling) of the elements in period 3 of the Periodic Table are as follows with the elements arranged in alphabetical order:

Al Cl Mg Na P S Si
1.5 3.0 1.2 0.9 2.1 2.5 1.8

Arrange the elements in the order in which they occur in the Periodic Table from left to right. (The group 1 element first, followed by the group 2 element and so on, up to group 7.)

A

Na, Mg, Al, Si, P ,S, Cl

24
Q

The electro-negativities (according to Pauling) of the elements in period 3 of the Periodic Table are as follows with the elements arranged in alphabetical order:

Al Cl Mg Na P S Si
1.5 3.0 1.2 0.9 2.1 2.5 1.8

The element below sodium in the same group would be expected to have a ______ (lower/higher) electro-negativity than sodium and the element above chlorine would be expected to have a _________ (lower/higher) ionization potential than chlorine

A

lower, higher

25
Q

The electro-negativities (according to Pauling) of the elements in period 3 of the Periodic Table are as follows with the elements arranged in alphabetical order:

Al Cl Mg Na P S Si
1.5 3.0 1.2 0.9 2.1 2.5 1.8

On moving from left to right in a given period, the number of shells (remains the same/increases/decreases).

A

remains the same

26
Q

The electro-negativities (according to Pauling) of the elements in period 3 of the Periodic Table are as follows with the elements arranged in alphabetical order:

Al Cl Mg Na P S Si
1.5 3.0 1.2 0.9 2.1 2.5 1.8

On moving down a group, the number of valence electrons (remains the same/increases/decreases).

A

remains the same

27
Q

Parts (i) to (v) refer to changes in the properties of elements on moving 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.
(i) The non-metallic character of the elements:

(a) decreases (b) increases (c) remains the same (d) depends on the period.

A

(b) increases

28
Q

Parts (i) to (v) refer to changes in the properties of elements on moving 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.

The electro-negativity:

(a) depends on the number of valence electrons (b) decreases
(c) remains the same (d) increases.

A

(d) increases

29
Q

Parts (i) to (v) refer to changes in the properties of elements on moving 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.

The ionization potential:
(a) goes up and down (b) decreases (c) increases (d) remains the same.

A

(c) increases

30
Q

Parts (i) to (v) refer to changes in the properties of elements on moving 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.

The atomic size:

(a) decreases (b) increases
(c) remains the same (d) sometimes increases and sometimes decreases.

A

decreases

31
Q

Parts (i) to (v) refer to changes in the properties of elements on moving 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.

The electron affinity of the elements in group 1 to 7:

(a) goes up and then down (b) decreases and then increases
(c) increases (d) decreases.

A

(a) goes up and then down

32
Q

The elements of one short period of the Periodic Table are given below in order from left to right.
Li Be B C O F Ne

To which period do these elements belong?

A

second period

33
Q

The elements of one short period of the Periodic Table are given below in order from left to right.
Li Be B C O F Ne

One element of this period is missing. Which is the missing element and where should it be placed?

A

nitrogen (N) is missing. This element should be placed between carbon and oxygen

34
Q

The elements of one short period of the Periodic Table are given below in order from left to right.
Li Be B C O F Ne

Which one of the elements in this period shows the property of catenation?

A

carbon (C) shows the property of catenation

35
Q

The elements of one short period of the Periodic Table are given below in order from left to right.
Li Be B C O F Ne

Place the three elements fluorine, beryllium and nitrogen in the order of increasing electro-negativity.

A

beryllium, nitrogen and fluorine

36
Q

The elements of one short period of the Periodic Table are given below in order from left to right.
Li Be B C O F Ne

Which one of the above elements belongs to the halogen series?

A

fluorine (F).

37
Q

A group of elements in the Periodic Table are given below (Boron is the first member of the group and Thallium is the last):
Boron, Aluminium, Gallium, Indium, Thallium.

Which element has the most metallic character?

A

Thallium

38
Q

A group of elements in the Periodic Table are given below (Boron is the first member of the group and Thallium is the last):
Boron, Aluminium, Gallium, Indium, Thallium.

Which element would be expected to have the highest electro-negativity?

A

Boron

39
Q

A group of elements in the Periodic Table are given below (Boron is the first member of the group and Thallium is the last):
Boron, Aluminium, Gallium, Indium, Thallium.

If the electronic configuration of Aluminium is 2, 8, 3 how many electrons are there in the outer shell of Thallium?

A

3

40
Q

A group of elements in the Periodic Table are given below (Boron is the first member of the group and Thallium is the last):
Boron, Aluminium, Gallium, Indium, Thallium.

The atomic number of boron is 5. Write the chemical formula of the compound formed when Boron reacts with Chlorine.

A

BCl3

41
Q

A group of elements in the Periodic Table are given below (Boron is the first member of the group and Thallium is the last):
Boron, Aluminium, Gallium, Indium, Thallium.

Will the elements in the group to the right of this Boron group be more metallic or less metallic in character? Justify your answer.

A

Less metallic due to increase in ionization energy

42
Q
A
43
Q
A

Chemistry ICSE X (4 decks)

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