Periodic Table Quiz Unit 1 L1

Who discovered the term 'atomic number' of an element?

• Bohr

• Mendeleev

• Moseley

• Rutherford

What did Moseley add to Mendeleev's periodic table?

• Noble gases

• Transition elements

• Lanthanides and actinides

• Artificially prepared elements

How are elements in the modern periodic table classified?

• By atomic number

• By atomic weight

• By number of protons

• By number of energy levels

How many horizontal periods are there in the modern periodic table?

• 8

• 9

• 7

• 6

Where are the elements of the s-block located in the periodic table?

• Left side

• Right side

• Middle

• Below

What does the number of energy levels occupied by electrons indicate?

• Atomic weight

• Period number

• Atomic number

• Group number

What is the atomic number of the element in group 3A and period 2?

• 10

• 5

• 15

• 20

What is the kind of element that lies in group 7A and period 2?

• Halogens

• Noble gas

• Alkaline earth metal

• Alkali metal

What do elements of the same group have in common?

• Different number of energy levels

• Similar chemical properties

• Different chemical properties

• Similar number of energy levels

Why did Mendeleev leave gaps in his periodic table?

• To correct the estimated atomic weights

• To classify elements by energy levels

• To arrange elements by atomic number

• To predict the discovery of new elements