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WorksheetsInvestigation 2 Test
Total questions: 15
Worksheet time: 8mins
The effective nuclear charge, Zeff, experienced by valence electrons in an atom can be estimated from the equation: Zeff = the number of protons – the number of core electrons
Using this estimation, effective nuclear charge for Main Group elements would _________ left to right across a period and _______ down a group. Which option correctly completes the blanks in the statement?
increase; decrease
increase; remain the same
decrease; remain the same
remain the same; remain the same
How do core electrons differ from valence electrons? Choose all that apply (2)
Core electrons are found on the lower energy levels, while valence electrons are in the outermost energy level
Valence electrons shield, core electrons do not
Core electrons shield, valence electrons do not
Which statements are true concerning elements in the same group of the periodic table? Select all that apply. (2)
They have similar Physical and Chemical properties.
They have the same number of shells of electrons.
They have the same outer shell electron configuration (Valence electrons)
They are all metals or nonmetals, but not both.
The valence electrons of an atom do not experience the full attractive force of protons in the atom's nucleus due to the presence of inner core electrons. The reduction in nuclear charge experienced by valence electrons due to inner core electrons is called the
ionization energy effect
nuclear charge effect
periodic law effect
shielding effect
Which elements are good conductors of electricity and heat?
Metals
Nonmetals
Metalloids
A rule that states that repeating chemical and physical properties of elements change periodically with the atomic number of the elements is the _________.
Periodic Law
Octet rule
Group rule
Actinide
The concept of shielding happens because of
attraction between nucleus and valence electrons
attraction between nucleus and core electrons
repulsion between valence electrons and other valence electrons
repulsion between core electrons and valence electrons
Shielding electrons causes the force of attraction to the nucleus to
increase
decrease
The effective nuclear charge is _____ the actual nuclear charge
equal to
less than
greater than
Which description accurately represents an anion?
an atom that gains one or more electrons
an atom that loses one or more electrons
atoms that don't gain or lose electrons
Choose the answer choice that best describes why cations are smaller than the parent atoms.
cations lose electron(s) resulting in more protons than electrons. Zeff increases
cations gain electron(s) resulting in more electrons than protons. Zeff decreases
What is ionization energy?
Energy needed to destroy an atom
Energy required to remove an electron
Energy needed to split an electron
Energy required to add an electron
What is electron affinity?
The energy needed to remove an electron from an atom
The energy needed to add an electron to an atom
When atoms gain one or more electrons and have a net positive charge
When atoms lose one or more electrons and have a net negative charge
Choose the accurate description for the following periodic trend. Atomic radius ______ from left to right within a period.
Decreases
Increases
Stays constant
Choose the accurate description for the following periodic trend. Atomic radius ______ from top to bottom within a group.
decreases
increases
stays constant
