The Periodic Table

Question 1

Early chemists attempted to classify the elements according to their atomic weights

(1 mark)

Answer 1

What we now call relative atomic mass .

Question 2

Relative Atomic Masses of the Elements increased by

1 mark

Answer 2

Steps

Question 3

Many elements were unknown which means

2 marks

Answer 3

Early tables were incomplete - They also contained errors.

Question 4

Early Periodic Table errors

2 marks

Answer 4

Some elements that were not similar were placed together and the table was incomplete.

Question 5

Mendeleev’s Periodic Table

3 marks

Answer 5

Created by Dmitri Mendeleev (1869) - Periodic Table that forms the basis of the one we use today.

Question 6

Year Mandeleev’s Table was published

1 mark

Answer 6

1869

Question 7

Russian Chemist - Dmitri Mendeleev

2 marks

Answer 7

Created Mendeleev’s Table an early Periodic Table that forms the basis of the one we use today.

Question 8

Ways in which Mendeleev’s Periodic Table was different from those of other scientists.

(3 marks)

Answer 8

He arranged the elements in order of increasing atomic weight - leaving gaps (for undiscovered Elements) where no element fitted the repeating pattern.

Question 9

Revisions of Mendeleev’s Periodic Table:

Modern Periodic Table - arranged in order of increasing atomic number

(2 marks)

Answer 9

Mendeleev’s Table - is arranges in order of atomic weight.

Question 10

Revisions of Mendeleev’s Periodic Table:

Modern Periodic Table - there are over 100 elements and no gaps in the Periodic Table.

(2 marks)

Answer 10

Mendeleev’s Table - Some Elements were unknown so gaps were left where no Element fitted the repeating pattern.

Question 11

Revisions of Mendeleev’s Periodic Table:

Morden Periodic Table - group of unreactive elements (the noble gases) were discovered at the end of the 1800s.

(2 marks)

Answer 11

Mendeleev’s Table - did not include Noble Gases.

Question 12

Revisions of Mendeleev’s Periodic Table

Modern Periodic Table - includes transition metals, actinides and lanthanides.

(3 marks)

Answer 12

Mendeleev’s Table - does not include transition metals, actinides and lanthanides.

Question 13

Each element in the Periodic Table

1 mark

Answer 13

Is a substance that consists of only one type of atom.

Question 14

Elements cannot be

1 mark

Answer 14

Broken down into simpler substances by chemical means.

Question 15

Why is the Modern Table called a “periodic” table?

1 mark

Answer 15

Because the elements with similar properties appear at regular intervals.

Question 16

Periodic Table: the vertical columns

1 mark

Answer 16

Groups

Question 17

Periodic Table: the horizontal rows

1 mark

Answer 17

Periods

Question 18

Metals on the Periodic Table

7 marks

Answer 18

Division of the Periodic Table - metal elements are on the left of a ‘stepped line’ that runs below
- boron (B), silicon (Si), arsenic (As), tellurium (Te), and astatine (At).

Question 19

Properties of a typical metal in a solid state.

5 marks

Answer 19

• Good conductor of electricity/heat.
• Generally high melting points.
• Ductile
• Malleable
• Sonorous

Question 20

Properties of a typical Non-Metal in a solid state.

6 marks

Answer 20

• Poor conductor of electricity/heat.
• Generally low Melting points.
• Brittle (breaks when hammered and snaps when stretched)
• Not sonorous

Question 21

At room temperature:

8 marks

Answer 21

• Metals are solids, except mercury – it is a liquid.
• Non-metal elements - hydrogen nitrogen, oxygen, fluorine, chlorine/all the Noble Gases are gases.
• Bromine (non-metal) is a liquid.
• Every other element is a solid.

Question 22

Noble Gases group on the Periodic Table

1 mark

Answer 22

Group 0