Midterm 2 Atom/Periodic Table

Quiz
•
Chemistry
•
11th Grade
•
Hard
Mary Giza
FREE Resource
30 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which statement describes the general trends in electronegativity and first ionization energy as the elements in Period 3 are considered in order from Na to Cl?
Electronegativity increases, and first ionization energy decreases.
Electronegativity decreases, and first ionization energy increases.
Electronegativity and first ionization energy both increase.
Electronegativity and first ionization energy both decrease.
Answer explanation
As you move from Na to Cl in Period 3, electronegativity and first ionization energy both increase due to increasing nuclear charge and decreasing atomic radius, making it harder to remove an electron and attracting electrons more strongly.
2.
MULTIPLE SELECT QUESTION
30 sec • 1 pt
Which electron configuration represents the electrons in an atom of Ga in an excited state?
2-8-17-3
2-8-17-4
2-8-18-3
2-8-18-4
Answer explanation
Gallium (Ga) has an atomic number of 31, with a ground state configuration of 2-8-18-3. In an excited state, one electron can be promoted to a higher energy level, resulting in configurations like 2-8-17-4 or 2-8-18-3.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which notations represent different isotopes of the element sodium?
32S and 34S
S2− and S6+
Na+ and Na0
22Na and 23Na
Answer explanation
The correct choice is \(^{22}Na\) and \(^{23}Na\) as they represent isotopes of sodium, differing in neutron number. Other options either refer to different elements or charge states, not isotopes.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Two forms of solid carbon, diamond and graphite, differ in their physical properties due to the differences in their
atomic numbers
crystal structures
isotopic abundances
percent compositions
Answer explanation
Diamond and graphite are both forms of carbon, but they have different crystal structures. This difference in arrangement of carbon atoms leads to their distinct physical properties, making 'crystal structures' the correct choice.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The atomic mass of magnesium is the weighted average of the atomic masses of
all of the artificially produced isotopes of Mg
all of the naturally occurring isotopes of Mg
the two most abundant artificially produced isotopes of Mg
the two most abundant naturally occurring isotopes of Mg
Answer explanation
The atomic mass of magnesium is calculated as the weighted average of all naturally occurring isotopes of Mg, reflecting their relative abundances, not just the artificially produced ones or a limited selection.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
When an excited electron in an atom moves to the ground state, the electron
absorbs energy as it moves to a higher energy state
absorbs energy as it moves to a lower energy state
emits energy as it moves to a higher energy state
emits energy as it moves to a lower energy state
Answer explanation
When an excited electron moves to a lower energy state (ground state), it releases energy in the form of light or heat. Therefore, the correct choice is that the electron emits energy as it moves to a lower energy state.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Compared to the charge of a proton, the charge of an electron has:
a greater magnitude and the same sign
a greater magnitude and the opposite sign
the same magnitude and the same sign
the same magnitude and the opposite sign
Answer explanation
The charge of a proton is +1, while the charge of an electron is -1. They have the same magnitude (1 unit of charge) but opposite signs, making the correct answer 'the same magnitude and the opposite sign'.
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