Unit 3- TEST 1

1. Who first proposed the Law of Triads?

• A) Mendeleev

• B) Lothar Meyer

• C) Dobereiner

• D) Newlands

2. In Dobereiner’s triads, the atomic weight of the middle element is:

• A) The highest in the group

• B) The average of the other two

• 
  C) Twice the smallest one

• D) Half of the largest one

3. Newlands arranged elements in increasing order of:

• A) Atomic number

• B) Atomic weight

• C) Valency

• D) Density

4. According to Newlands’ Law of Octaves, every eighth element has properties similar to the:

• A) Fourth element

• B) First element

• C) Second element

• D) Last element

5. Modern Periodic Law states that properties of elements are periodic functions of their:

• Atomic weights

• Valence electrons

• Density

• Atomic numbers

Who discovered that atomic number is more fundamental than atomic mass?

• Moseley

• Dalton

• Seaborg

• Mendeleev

How many groups are there in the Modern Periodic Table according to IUPAC?

• 7

• 8

• 18

• 32

8. The first period of the Modern Periodic Table contains:

• 2 elements

• 8 elements

• 18 elements

• 32 elements

The group 1 elements have the general outer electronic configuration:

• ns²

• np¹

• ns¹

• np²

Which block contains the transition elements?

• p-block

• s-block

• d-block

• f-block