Q 01/05

Who is widely credited with publishing the first recognizable periodic table?

A) Antoine Lavoisier

B) John Dalton

C) Jöns Jacob Berzelius

D) Dmitri Mendeleev

Answer · why

D) Dmitri Mendeleev

Dmitri Mendeleev, a Russian chemist, published the first generally accepted periodic table in 1869. He arranged elements by atomic mass and predicted ...

Q 02/05

Which yellow element is the 'brimstone' of the Bible's fire and brimstone?

A) Sulfur

B) Phosphorus

C) Sodium

D) Gold

Answer · why

A) Sulfur

Sulfur is the Bible's brimstone, a word meaning 'burning stone': set alight, the yellow solid melts into a blood-red liquid and burns with a blue flam...

Q 03/05

What do elements in the same horizontal row of the periodic table share?

A) Number of electron shells

B) Number of valence electrons

C) Chemical properties

D) Physical state at STP

Answer · why

A) Number of electron shells

Number of electron shells: each new row starts when a fresh, higher shell takes its first electron, so everything from sodium to argon has exactly thr...

Q 04/05

Which of these elements has the highest electronegativity?

A) Oxygen

B) Fluorine

C) Carbon

D) Chlorine

Answer · why

B) Fluorine

Fluorine pulls shared electrons harder than any other element, 3.98 on the Pauling scale, which makes it so reactive that several chemists were injure...

Q 05/05

Which category of elements are generally shiny, malleable, and good conductors of heat and electricity?

A) Nonmetals

B) Metals

C) Metalloids

D) Noble gases

Answer · why

B) Metals

Metals owe these traits to a 'sea' of loosely held outer electrons that drifts between the atoms, carrying heat and current, reflecting light and lett...