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Worksheet: Atomic and Ionic Radii

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

Q1:

Which element has the smallest atomic radius?

  • AGallium
  • BIndium
  • CAluminum
  • DBoron

Q2:

Rank the following ions in order of increasing radius: A s 3 – , B r – , K + , M g 2 + .

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

Q3:

Rank the following ions in order of increasing radius: N a + , L i + , C l – , S 2 – .

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

Q4:

Rank the following atoms in order of increasing atomic radius: B a , G e , A s , C a .

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

Q5:

Which of the following elements has the largest atomic radius?

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

Q6:

Which of the following elements has the largest atomic radius?

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

Q7:

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

  • AChlorine
  • BFluorine
  • CBromine
  • DIodine

Q8:

Rank the following atoms in order of increasing atomic radius: M g , C s , R b , C a .

  • A R b < C s < M g < C a
  • B C s < R b < C a < M g
  • C C a < M g < C s < R b
  • D M g < C a < R b < C s
  • E M g < R b < C a < C s

Q9:

Rank the following ions in order of increasing radius: A s 3 – , B r – , K + , M g 2 + .

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

Q10:

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

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

Q11:

Which of the following elements has the smallest atomic radius?

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

Q12:

Which Group 16 element has the largest atomic radius?

  • ASulfur
  • BOxygen
  • CSelenium
  • DTellurium

Q13:

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 G e < B r < K r < F l
  • C F l < G e < B r < K r
  • D K r < B r < G e < F l
  • E K r < F l < B r < G e

Q14:

Rank the following atoms in order of increasing atomic radius: M g , C s , R b , C a .

  • A R b < C s < M g < C a
  • B C s < R b < C a < M g
  • C C a < M g < C s < R b
  • D M g < C a < R b < C s
  • E M g < R b < C a < C s

Q15:

Rank the following ions in order of increasing radius: N a + , L i + , C l – , S 2 – .

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

Q16:

Which of the following elements has the smallest atomic radius?

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

Q17:

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

Q18:

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

  • AVan der Waals radius
  • BCovalent bond
  • CAtomic radius
  • DBond length
  • EBond polarity

Q19:

Rank the following atoms in order of increasing atomic radius: B a , G e , A s , C a .

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

Q20:

Which ion has the smallest radius?

  • A T e 2 −
  • B S e 2 −
  • C S 2 −
  • D O 2 −

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