AnswersCR Chemistry S1 Q3050OXPeriodic Trends

Periodic Trends — Unit test Answers

13 verified answers3 views
1
Free Preview

Which physical method can be used for obtaining a sample of salt from a small beaker of salt water?

A
boiling
B
freezing
C
chromatography
D
sorting
2
Free Preview

Which element is the most reactive?

A
sodium
B
nickel
C
carbon
D
oxygen
3

Which element has 32 protons in its nucleus?

A
phosphorus
B
cobalt
C
germanium
D
sulfur
4

Which of the following symbols would be included in the noble gas notation for an element that had valence electrons in the 5s subshell?

A
Ar
B
Kr
C
Xe
D
Rn
5

In which orbitals would the valence electrons for selenium (Se) be placed?

A
s orbital and f orbital
B
s orbital only
C
s orbital and p orbital
D
d orbital only
6

When electrons are removed from the outermost shell of a calcium atom, the atom becomes

A
an anion that has a larger radius than the atom.
B
an anion that has a smaller radius than the atom.
C
a cation that has a larger radius than the atom.
D
a cation that has a smaller radius than the atom.
7

The diagram below shows some subatomic particles.Which of these statements best identifies the particle that is labeled with an X?

Question illustration
A
It is either a nucleus or a proton.
B
It is either a proton or a neutron.
C
It is either a neutron or an electron.
D
It is either an electron or a nucleus.
8

Which pure substance can be classified as an element?

A
H2
B
NO3
C
NaCl
D
H2SO4
9

The table below gives the numbers of protons, electrons, and neutrons in four atoms.AtomNumber of protonsNumber of neutronsNumber of electrons198929983991049109Based on the table, which atom has a charge of –1?

A
1
B
2
C
3
D
4
10

Carbon-12 and carbon-13 are isotopes of carbon. Which of the following statements is correct?

A
They both have seven protons in the nucleus.
B
They both have the same mass number.
C
They both have seven neutrons in the nucleus.
D
They both have the same atomic number.
11

How did the work of Dmitri Mendeleev differ from that of John Newlands in the development of the periodic table?

A
Mendeleev arranged the elements according to increasing atomic mass.
B
Mendeleev predicted elements that would later be discovered.
C
Mendeleev identified elements that had similar properties.
D
Mendeleev organized elements into triads based on their properties.
12

An atom contains one proton, one electron, and one neutron. Which two particles are most similar in mass?

A
the neutron and the electron
B
the proton and the electron
C
the proton and the neutron
D
the neutron and the atom
13

Which of these elements has an electron configuration of [Kr]5s2?

A
barium
B
calcium
C
rubidium
D
strontium
14

Who was the first to propose the existence of atoms?

A
John Dalton
B
Democritus
C
Joseph Proust
D
Ernest Rutherford
15

A single atom of an element has 11 protons, 11 electrons, and 12 neutrons. Which element is it?

A
V
B
Na
C
Mg
D
Se
16

Which characteristic is given by the angular momentum quantum number?

A
orbital size
B
orbital mass
C
orbital shape
D
orbital orientation
17

Which describes Ernest Rutherford’s experiment?

A
Positive particles are fired at gold foil. Most bounce back, but some pass through.
B
Negative particles are fired at gold foil. Most bounce back, but some pass through.
C
Positive particles are fired at gold foil. Most pass through, but some bounce back.
D
Negative particles are fired at gold foil. Most pass through, but some bounce back.
18

Which set of numbers gives the correct possible values of l for n = 2?

A
0
B
0, 1
C
0, 1, 2
D
0, 1, 2, 3
19

The elements of which group are nonreactive?

A
halogens
B
alkaline earth metals
C
noble gases
D
alkali metals
20

How many valence electrons does aluminum (Al) have available for bonding?

A
1
B
2
C
3
D
4

Did you find these answers helpful?

More from this Course

Quiz
20 verified answers

Unit Test

Quiz
25 verified answers

Unit Test

Quiz
42 verified answers

Unit Test