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 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

Q2:

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

Q3:

Which of the following elements has the smallest atomic radius?

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

Q4:

Which of the following elements has the largest atomic radius?

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

Q5:

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

Q6:

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

Q7:

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 +

Q8:

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 +

Q9:

Which of the following elements has the smallest atomic radius?

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

Q10:

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

Q11:

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

Q12:

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 – – + +

Q13:

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 – +

Q14:

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

Q15:

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)

Q16:

Which element has the smallest atomic radius?

  • AGallium
  • BIndium
  • CAluminum
  • DBoron

Q17:

Which ion has the smallest radius?

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

Q18:

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

  • AChlorine
  • BFluorine
  • CBromine
  • DIodine

Q19:

Which Group 16 element has the largest atomic radius?

  • ASulphur
  • BOxygen
  • CSelenium
  • DTellurium

Q20:

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

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

Q21:

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

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

Q22:

Which of the following ions is the smallest?

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

Q23:

Which of the following ions is the largest?

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

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