Quiz 3.1

Which set of triads DOES NOT fit Dobereiner's Law of Triads?

• lithium, sodium, potassium

• calcium, strontium, barium

• phosphorus, arsenic, antimony

• chlorine, bromine, iodine

The Newlands' law of octaves for the classification of elements was found to be applicable only up to the _______ element

• potassium

• calcium

• cobalt

• phosphorus

He organized the Periodic Table according to atomic number.

• Mendeleev

• JJ Thomson

• Ernest Rutherford

• Niels Bohr

• Henry Moseley

Where are the transitional metals found on the periodic table?

• d-block

• p-block

• f-block

• s-block

What was Dmitri Mendeleev's greatest contribution to the history of the periodic table?

• He arranged all of the known elements by their atomic number
• He realised that there was a pattern of reactivity which repeated every 8 elements
• He predicted the existence (and properties) of new elements
• He identified the "law of triads" which became the groups