Foundations of Periodic Table

Which scientist edited the Periodic Table and arranged elements in increased atomic number?

• Rutherford

• Dalton

• Mendeleev

• Mosely

Which scientist created the Periodic Table and arranged elements in increasing atomic mass?

• Rutherford

• Thomson

• Mendeleev

• Moseley

Elements in the same group or family have _____________.

• the same number of valence electrons and different properties.

• the same number of valence electrons and similar properties

• different number of valence electrons and similar properties.

• different number of valence electrons and different properties.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

In the modern periodic table elements are arranged by:

• atomic mass
• atomic number
• valence electrons
• number of isotopes

Why were there blank spaces left in Mendeleev's periodic table?                                              

• He didn't know what to put there.
•  Undiscovered elements not yet known.
• Multiple elements could have fit
• He forgot to add the elements in.

Who was the scientist who first grouped elements with similar properties? The modern idea of periodic groups was based on his concept of triads.

• Mendeleev
• Dobereiner
• Mosely
• Ramsey

Which scientist was the first to see a repetition of properties when organized elements according to increasing atomic mass? He described the sets of preparing elemental properties as octaves, precursors to the Periodic Table's periods.

• Dobereiner

• Mendeleev

• Seaborg

• Newland

Glenn Seaborg's work led to a modification of the periodic table. This modification was...

• The addition of the actinide series (elements 94-102).

• The addition of the alkali metals (Group 1 elements).

• The completion of the all the synthetic elements.

• The removal of synthetic elements.

Mendeleev classified elements based on not only atomic mass but what else?                                                   

• reactivity
• boiling points
• physical properties only 
•  chemical & physical properties

Tags

NGSS.HS-PS1-1

What was significant about the X-ray experiments performed by Henry Moseley?

• It demonstrated that all atoms contained protons in their nuclei
• It explained what made up the "missing" mass in the nucleus
• It led to the idea that electrons can only occupy specific "orbits" around the nucleus
• It allowed people to determine the nuclear charge (i.e. # of protons) of any atom