Periodic Table Pioneers
Who proposed the law of octaves?
John Newlands
Which element has the smaller atomic radius: calcium or chlorine?
Chlorine
What is the only metal that is liquid at room temperature?
Mercury
What element is represented by Na?
Sodium
True or False: Atomic radii increase down a group
True
Who is credited with creating the first ordered periodic table?
Dmitri Mendeleev
What is the energy required to remove an electron from an atom called?
Ionization energy
Elements that conduct electricity and are shiny and malleable are called what?
Metals
What element makes up 21% of the Earth's atmosphere?
Oxygen
True or False: All noble gases form compounds.
False
Who revisited the periodic law by using atomic number as the organizing principle?
Henry Moseley
What trend is opposite to atomic radius?
First ionization energy
Elements with characteristics of metals and nonmetals are called?
Metalloids
What is the most electronegative and reactive element?
Fluorine
Would Ca or Ca2+ have a smaller radius?
Ca2+ fewer electrons pulled closer to the nucleus
Why do elements in the same group have similar properties?
They have similar electron configurations.
Which element has the greater electronegativity: Na or Cl?
Chlorine
Group 15 elements are also known as what?
Pnictogens
What compounds does oxygen form when bonded to other elements?
Oxides
What are pros and cons of recovering rare earth metals?
Pros: Industrial & tech users; Cons: Environmental harm
What do we call the horizontal rows on the periodic table?
Periods or Series
Which element has the greater first ionization energy: Li or Ne?
Neon
What two series together make up the inner transition metals?
Lanthanoids and Actinoids
Which element has a high density, three valence electrons, and corrodes in air?
Aluminum (except it does not have high density)
What's a key reason for grouping halogens together?
They are highly reactive and form salts with metals.