Do you remember who was responsible to arrange the known elements into "triads"?

• a. Alexander Chancourtois

• b. Dmitri Mendeleev

• c. John Newland

• d. Johann Döbereiner

Who was a German, developed the first periodic table in 1864 but was not published until 1870?

• a. Alexander Chancourtois

• b. Julius Lothar Meyer

• c. John Newland

• d. Johann Döbereiner

Who said; "There is no talent, neither genius without hard work"?

• a. Alexander Chancourtois

• b. Dmitri Mendeleev

• c. John Newland

• d. John Newland

Who proposed the law of Octaves in the arranging the elements in the periodic table?

• a. Johann Döbereiner

• b. Dmitri Mendeleev

• c. John Newland

• d. Julius Lothar Meyer

Who was the pioneer in arranging the elements in order of atomic number?

• a. Johann Döbereiner

• b. Henry Moseley

• c. Dmitri Mendeleev

• d. William Ramsay

This scientist predicted the existence and properties of unknown elements which he called eka-aluminum, eka-boron, and eka-silicon

• a. Johann Döbereiner

• b. Dmitri Mendeleev

• c. John Newland

• d. Julius Lothar Meyer

What property did Mendeleev use to arrange the elements in a table?

• a. alphabetical

• b. density

• c. melting point

• d. atomic mass

This model was developed after J.J. Thomson discovered electrons, a particle smaller than an atom. It shows electrons floating freely in a positive space.

• a. The "Rutherford Model" of the atom

• b. The "Plum Pudding Model" of the atom

• c. Democritus's model of the atom

• d. The "Solar System Model" of the atom

Ernest Rutherford discovered that atoms were mostly _________________.

• a. negatively charged

• b. positively charged

• c. electron

• d. empty space

Which scientist is credited for creating the "solar system" model of the atom?

• a. Schrodinger

• b. Rutherford

• c. Bohr

• d. Thompson