History and Parts of Periodic Table

Which of the following is a contribution of Mendeleev in the Periodic Table?

• used X-rays to determine atomic number of elements

• arranged elements according to atomic number

• predicted the characteristics of unknown elements

• grouped elements into triads with similar physical and chemical properties

Which of the following is the contribution of Moseley in the periodic table?

• used X-rays to determine the atomic number of elements

• arranged elements according to atomic mass

• predicted the characteristics of unknown elements

• grouped elements with similar properties into triads

What is the modern group number of Silicon (Si)? (Z=14)

• 3

• 4

• 14

• 4A

What is the American group number of Iodine (I)? (Z=53)

• 5

• 7

• 7A

• 17

What is the period number of Calcium (Ca)? (Z=20)

• 2

• 2A

• 4

• 4A

Which of the following is NOT a metalloid?

• B (Z=5)

• Al (Z=13)

• Si (Z=14)

• Ge (Z=32)

Which element occupies the f block?

• H (Z=1)

• F (Z=9)

• Fe (Z=26)

• U (Z=92)

Which of the following is NOT a transition metal?

• Uranium (U) (Z=92)

• Iron (Fe) (Z=26)

• Tin (Sn) (Z=50)

• Nickel (Ni) (Z=28)

Which element is a noble gas?

• H (Z=1)

• N (Z=7)

• O (Z=8)

• He (Z=2)

Which of the following is an alkali metal?

• K (Z=19)

• Mg (Z=12)

• Al (Z=13)

• Si (Z=14)