Periodic Table Trends

Chlorine, bromine, and iodine were grouped together in the earliest forms of the periodic table, including the table developed by Mendeleev. What was an organizing principle in this grouping at that time?

• Atoms of the three elements had approximately the same mass.
• The three elements react the same way with other elements.
• The elements have the same number of valence electrons.
• These three elements are all gases at room temperature

The early periodic table organized the elements in periods of increasing atomic mass. What information is currently used to organize the elements on the periodic table?

• number of valence electrons 
• number of energy levels 
• atomic number 
• ionic radius 

All elements found on the left side of the Periodic Table of the Elements have what properties in common?

• They conduct heat and electricity 
• They are all gases 
• They are brittle and dull
• They are radioactive

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Which of these elements has an electron structure most similar to that of element X?

• 1
• 2
• 3
• 4

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Based on their locations in the periodic table, which element has chemical properties most similar to those of calcium, Ca?

• beryllium, Be
• potassium, K
• titanium, Ti
• yttrium, Y

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The number of valence electrons in an element affects the reactivity of that element. Which element listed has the fewest valence electrons?

• beryllium (Be)
• sodium (Na) 
• oxygen (O) 
• neon (Ne)

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According to the Periodic Table of the Elements, which set of elements has similar properties?

• H, C, I
• He, H, Al
• He, Ne, Ar
• Na, Ca, Al

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Hydrogen is a gas at a room temperature, but it is found with the alkali metals in group 1 (1A) on the periodic table. Which is the most likely reason hydrogen is grouped with alkali metals?

• All group 1 elements have the same number of protons. 
• Alkali metals behave like hydrogen gas at high temperatures. 
• Hydrogen behaves more like the alkali metals than other gases. 
• All group 1 elements have one valence electron. 

Sodium (Na) and potassium (K) are in the same group on the periodic table. Based on their locations, which statement about sodium and potassium is true?

• Sodium is less electronegative than potassium. 
• Sodium has fewer energy levels than potassium. 
• Sodium has a larger ionic radius than potassium. 
• Sodium has lower ionization energy than potassium. 

What is the family name of this group of elements? 

• Alkali metals 
• Halogens 
• Noble Gases 
• Alkali Earth Metals 

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