Suppose an atom has a mass number of 23. Which statement is true beyond any doubt?

The number of protons does not equal the number of neutrons.

The tendency of an element to react is closely related to

the number of valence electrons in atoms of the element.

Which statement about subatomic particles is NOT true?

Protons and neutrons have the same charge.

What can you assume has happened if an electron moves to a higher energy level?

The electron has gained energy.

Which statement about subatomic particles is true?

electron has far less mass than either a proton or neutron.

Atoms of the most reactive elements tend to have

one or seven valence electrons.

What does the electron cloud model describe?

the most likely locations of electrons in atoms

In an atomic model that includes a nucleus, positive charge is

concentrated in the center of an atom.

Which statement is NOT true about the elements fluorine, chlorine, and iodine?

They are similar to noble gases.

To find the number of neutrons in an atom, you would subtract

atomic number from mass number.

The atomic mass of an element is

a weighted average of the masses of an element’s isotopes.

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Atoms and the Periodic Table

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Atomic Structure and Periodic Table Quiz

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Answers

1
Suppose an atom has a mass number of 23. Which statement is true beyond any doubt?
The atomic number is less than 11.
The number of protons does not equal the number of neutrons.
The atom has an odd number of neutrons.
The atom is not an isotope.
2
Democritus thought that matter was made of tiny particles
of earth, air, fire, and water.
b. that could not be divided.
d. that were all round and smooth.
c. that could be divided
3
Which of the following is unique for any given element?
the number of neutrons
the mass of a neutron
the charge on the electrons
the number of protons
4
Who provided evidence for the existence of a nucleus in an atom?
John Dalton
Democritus
Ernest Rutherford
J. J. Thomson
5
The tendency of an element to react is closely related to
the number of valence electrons in atoms of the element.
the ratio of protons to neutrons in atoms of the element.
its atomic mass.
attractions between its atoms.
6
Which halogen is most likely to react?
I (iodine)
Cl (chlorine)
Br (bromine)
F (fluorine)
7
Which statement about subatomic particles is NOT true?
Protons and electrons have opposite charges.
Protons and neutrons have the same charge.
Protons and neutrons have almost the same mass.
Unlike protons and electrons, neutrons have no charge.
8
What can you assume has happened if an electron moves to a higher energy level?
The atom has lost an electron.
The electron has lost energy.
The electron has gained energy.
The atom has become more stable.
9
Group 7A of the periodic table contains the
least reactive metals.
most reactive nonmetals
least reactive nonmetals.
most reactive metals
10
As you move from left to right across a period, the number of valence electrons
decreases
stays the same.
increases and then decreases.
increases.
11
Which statement about subatomic particles is true?
Unlike protons or neutrons, electrons have no mass.
electron has far less mass than either a proton or neutron.
Neutrons have no charge and no mass.
Protons, neutrons, and electrons have about the same mass.
12
Atoms of the most reactive elements tend to have
eight valence electrons.
no valence electrons.
four or five valence electrons.
one or seven valence electrons.
13
Greek philosopher Democritus coined what word for a tiny piece of matter that can't be divided?
Element
Atom
Molecule
Electron
14
What does the electron cloud model describe?
the number of electrons in an atom
the mass of the electrons in an atom
the most likely locations of electrons in atoms
the precise locations of electrons in atoms
15
In an atomic model that includes a nucleus, positive charge is
concentrated at multiple sites in an atom.
spread evenly throughout an atom.
concentrated in the center of an atom.
located in the space outside the nucleus.
16
The number of protons in one atom of an element is that element’s
balanced charge.
isotope.
atomic number.
mass number.
17
Which of the following Group 1A elements is the most reactive?
K (potassium)
Li (lithium)
Na (sodium)
Cs (cesium)
18
At room temperature, none of the metals are
malleable
soft
gases
liquids
19
Which statement is NOT true about the elements fluorine, chlorine, and iodine?
They are all halogens.
They are all nonmetals.
They are similar to noble gases.
They react easily with metals.
20
To find the number of neutrons in an atom, you would subtract
mass number from atomic number.
isotope number from atomic number.
atomic number from mass number.
atomic number from electron number.
21
Which statement is true about Oxygen-17 and Oxygen-18?
They are isotopes of oxygen
The have the same mass number.
They do not have the same number of protons.
Their atoms have an identical mass.
22
The atomic mass of an element is
a ratio based on the mass of a carbon-12 atom.
sum of the protons and neutrons in one atom of the element.
a weighted average of the masses of an element’s isotopes.
twice the number of protons in one atom of the element.
23
Which subatomic particle has a negative charge?
quark
proton
neutron
electron
24
In Niels Bohr’s model of the atom, electrons move
like planets orbiting the sun.
like beach balls on water waves.
like balls rolling down a hill.
like popcorn in a popcorn popper.
25
What caused some of the alpha particles to bounce straight back from the gold foil?
nuclei in the gold atoms
other alpha particles
electrons in the gold atoms
negative charges in the gold atoms

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