Worksheet: Atomic and Ionic Radii

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In this worksheet, we will practice comparing the radii of atoms and ions, identifying and explaining trends across the periodic table.

Q1:

In which of the following sequences are elements arranged in order of increasing atomic radius?

  • A F l , K r , B r , G e
  • B F l , G e , B r , K r
  • C G e , B r , K r , F l
  • D K r , B r , G e , F l
  • E K r , F l , B r , G e

Q2:

Which of the following elements has an atomic radius smaller than that of fluorine?

  • A O
  • B A r
  • C L i
  • D C l
  • E N e

Q3:

Which of the following elements has the smallest atomic radius?

  • A I
  • B S i
  • C C l
  • D S r
  • E M g

Q4:

Which of the following elements has the largest atomic radius?

  • A K
  • B S e
  • C N a
  • D S
  • E B r

Q5:

Rank the following atoms in order of increasing atomic radius: Mg, Cs, Rb, Ca.

  • A M g < Ca < Rb < Cs
  • B C s < Rb < Ca < Mg
  • C R b < Cs < Mg < Ca
  • D M g < Rb < Ca < Cs
  • E C a < Mg < Cs < Rb

Q6:

Rank the following atoms in order of increasing atomic radius: Ba, Ge, As, Ca.

  • A G e , A s , C a , B a
  • B B a , C a , A s , G e
  • C A s , G e , C a , B a
  • D B a , C a , G e , A s
  • E C a , B a , A s , G e

Q7:

Rank the following ions in order of increasing radius: Na+, Li+, Cl–, S2–.

  • A L i + , N a + , C l – , S 2 –
  • B L i + , C l – , S 2 – , N a +
  • C S 2 – , C l – , L i + , N a +
  • D L i + , N a + , S 2 – , C l –
  • E C l – , S 2 – , L i + , N a +

Q8:

Rank the following ions in order of increasing radius: As3–, Br–, K+, Mg2+.

  • A M g 2 + , K + , A s 3 – , B r –
  • B A s 3 – , B r – , K + , M g 2 +
  • C M g 2 + , B r – , A s 3 – , K +
  • D B r – , A s 3 – , K + , M g 2 +
  • E M g 2 + , K + , B r – , A s 3 –

Q9:

Which of the following elements has the smallest atomic radius?

  • A S r
  • B I
  • C C l
  • D S i
  • E M g

Q10:

Rank the following atoms in order of increasing atomic radius: Ba, Ge, As, Ca.

  • A A s < G e < C a < B a
  • B C a < B a < A s < G e
  • C B a < C a < A s < G e
  • D G e < A s < C a < B a
  • E B a < C a < G e < A s

Q11:

Rank the following ions in order of increasing radius: Na+, Li+, Cl–, S2–.

  • A S 2 – , C l – , L i + , N a +
  • B L i + , N a + , S 2 – , C l –
  • C L i + , C l – , S 2 – , N a +
  • D C l – , S 2 – , L i + , N a +
  • E L i + , N a + , C l – , S 2 –

Q12:

Rank the following ions in order of increasing radius: As,Br,K,Mg3––+2+.

  • A M g , K , A s , B r 2 + + 3 – –
  • B M g , B r , A s , K 2 + – 3 – +
  • C B r , A s , K , M g – 3 – + 2 +
  • D A s , B r , K , M g 3 – – + 2 +
  • E M g , K , B r , A s 2 + + – 3 –

Q13:

Which word or phrase is defined as the distance between two directly-bonded atoms in a molecule?

  • AVan der Waals radius
  • BCovalent bond
  • CBond length
  • DBond polarity
  • EAtomic radius

Q14:

M g 2 + ions in the unit cell of a mineral can be exchanged for cations of a different element with no change in structure. The radius of the Mg2+ ion is 86 pm. Which of the following is the most likely identity of the substituted cation, assuming differences in charge can be neglected?

  • A L i + (radius 90 pm)
  • B A l 3 + (radius 68 pm)
  • C B e 2 + (radius 59 pm)
  • D C a 2 + (radius 114 pm)
  • E N a + (radius 116 pm)

Q15:

Which element has the smallest atomic radius?

  • AGallium
  • BAluminum
  • CIndium
  • DBoron

Q16:

Which ion has the smallest radius?

  • A O
  • B S e
  • C S
  • D T e

Q17:

Which halogen would form a binary rubidium compound (RbX) with the longest bond length?

  • ABromine
  • BFluorine
  • CIodine
  • DChlorine

Q18:

Which group 16 element has the largest atomic radius?

  • AOxygen
  • BSelenium
  • CSulfur
  • DTellurium

Q19:

Which of the following Period 2 elements has the smallest atomic radius?

  • A N e
  • B O
  • C B e
  • D C
  • E L i

Q20:

Which of the following Period 3 elements has the smallest atomic radius?

  • A P
  • B S i
  • C N a
  • D C l
  • E M g

Q21:

Which of the following ions is the smallest?

  • A M g 2 +
  • B A l 3 +
  • C S 2 –
  • D O 2 –
  • E Z n 2 +

Q22:

Which of the following ions is the largest?

  • A O 2 –
  • B A l 3 +
  • C Z n 2 +
  • D A l +
  • E S 2 –

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