Worksheet: The Structure of the Atom

In this worksheet, we will practice describing interactions between protons and neutrons in the atomic nucleus and electrons in the surrounding shells.

Q1:

How many neutrons does the isotope 2 9 1 3 A l contain?

Q2:

Protons and neutrons are examples of which type of particle?

  • ALepton
  • BQuark
  • CNuclide
  • DNucleon
  • ENucleus

Q3:

When the distance between atoms is less than the equilibrium bond length, the energy increases. What is the main cause of this effect?

  • ACollision between nuclei
  • BRepulsion between electrons
  • CDistortion of the optimum orbital geometries
  • DRepulsion between the positive nuclear charges
  • EThe Pauli exclusion principle

Q4:

An isotope has atomic number 26, mass number 58 and a charge of 2+.

How many protons does the isotope contain?

How many neutrons does the isotope contain?

How many electrons does the isotope contain?

What is the chemical symbol for this element?

  • A F e
  • B G e
  • C C e
  • D C r
  • E N i

Q5:

An ion contains 13 protons and 10 electrons.

What is the chemical symbol for this element?

  • A N e
  • B L i
  • C V
  • D A l
  • E C o

What is the charge of the ion?

  • A3+
  • B2+
  • C 3
  • D0
  • E 2

Q6:

An ion contains 34 protons and 36 electrons.

What is the chemical symbol for this element?

  • A Y b
  • B K r
  • C E r
  • D S e
  • E G e

What is the charge of the ion?

  • A 2
  • B1+
  • C2+
  • D0
  • E 1

Q7:

An isotope has symbol 7 + L i .

How many protons does the isotope contain?

How many neutrons does the isotope contain?

How many electrons does the isotope contain?

Q8:

An isotope has symbol 1 2 5 4 + T e .

How many protons does the isotope contain?

How many neutrons does the isotope contain?

How many electrons does the isotope contain?

Q9:

An isotope has symbol 1 0 9 A g .

How many protons does the isotope contain?

How many neutrons does the isotope contain?

How many electrons does the isotope contain?

Q10:

An isotope has symbol 1 5 3 N .

How many protons does the isotope contain?

How many neutrons does the isotope contain?

How many electrons does the isotope contain?

Q11:

An isotope has atomic number 53, mass number 127 and a charge of 1 .

How many protons does the isotope contain?

How many neutrons does the isotope contain?

How many electrons does the isotope contain?

What is the chemical symbol for this element?

  • A I
  • B T a
  • C T e
  • D W
  • E X e

Q12:

An ion of platinum has mass number 195 and contains 74 electrons.

How many protons does the ion contain?

How many neutrons does the ion contain?

What is the charge of the ion?

  • A2+
  • B0
  • C4+
  • D 4
  • E 2

Q13:

The structural formula of carbon dioxide is:

What is the empirical formula?

  • A C O 1 / 2
  • B C O
  • C C O 2 2
  • D C O 2

What is the molecular formula?

  • A C O 2 2
  • B C O 1 / 2
  • C C O
  • D C O 2

Q14:

An ion has the electron configuration 1s2 2s2 2p6 3s2 3p6. Which of the following pieces of information would not allow this ion to be precisely identified?

  • ACharge
  • BAtomic number
  • CIonization energy
  • DAtomic mass
  • EIonic radius

Q15:

Isotopes of an element always contain different numbers of which particles?

  • AElectrons
  • BProtons
  • CPositrons
  • DNeutrons
  • ENuclei

Q16:

Which of the following properties cannot vary between isotopes of the same element?

  • ACharge
  • BNucleon number
  • CMass number
  • DAtomic number
  • EBinding energy

Q17:

Which term describes two atoms with different atomic numbers but the same number of neutrons?

  • ANuclear isomers
  • BIsotopes
  • CIsobars
  • DIsotones
  • EIsodiaphers

Q18:

Which term is defined as the sum of the number of protons and neutrons in an atom?

  • AAtomic number
  • BRelative atomic mass
  • CMass excess
  • DMass number
  • ENuclear mass

Q19:

Which of the following is the best definition of the wave function of an atomic orbital?

  • AA surface connecting points of equal electron density around an atomic nucleus, containing a maximum of two electrons
  • BThe space around an atomic nucleus in which either one or a pair of electrons are most likely to be found
  • CA shell of electron density located at a fixed distance from an atomic nucleus, containing a maximum of two electrons
  • DA mathematical function describing the wave-like behavior of either one or a pair of electrons in an atom
  • EThe probability density of finding either one or a pair of electrons in the space around an atomic nucleus

Q20:

Which term is defined as the space around an atomic nucleus which, for an isolated atom, is occupied by all electrons possessing the same potential energy?

  • AOrbital
  • BShell
  • CCovalent bond
  • DSubshell
  • ELone pair

Q21:

Which term is defined as the number of mutually orthogonal atomic orbitals possessing the same potential energy?

  • APrincipal quantum number
  • BOrbital angular momentum
  • CAzimuthal quantum number
  • DOrbital degeneracy
  • EOrbital parity

Q22:

What are the basic components of an atom?

  • APhotons, neutrons, and electron neutrinos
  • BProtons, neutrinos, and electrons
  • CPhotons, neutrons, and electrons
  • DProtons, neutrons, and electrons
  • EProtons, neutrons, and electron neutrinos

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