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WorksheetsHomework #5 - Atomic Structure Day 1-5 Review
Total questions: 20
Worksheet time: 11mins
Which statement best explains why the nucleus is dense?
It contains only electrons
It contains nearly all of the atom’s mass
It contains orbitals of electrons
It is mostly empty space
Which particles are classified as nucleons?
Protons only
Neutrons only
Protons and neutrons
Protons and electrons
Which subatomic particle determines the identity of an element?
Proton
Neutron
Electron
Mass number
Which statement correctly describes electrons?
They are found in orbitals
They have a mass of about 1 u
They have a positive charge
They are found in the nucleus
Which part of an atom is always positively charged?
Nucleus
Electron cloud
Neutrons
Orbitals
A neutral atom has 15 protons, 16 neutrons, and 15 electrons. What is its overall charge?
+15
0
-1
31
Which isotope notation represents an atom of oxygen with 8 protons and 10 neutrons?
O-8
O-16
O-18
O-10
Which statement best compares the mass number and the atomic mass?
Both are weighted averages
Mass number is specific to one atom; atomic mass is an average across isotopes
Mass number is always a decimal; atomic mass is a whole number
They are always the same value
A chlorine atom has 17 protons, 18 neutrons, and 17 electrons. What is its mass number?
17
34.5
35
52
Which atom is an isotope of carbon-12?
6 protons, 6 neutrons
7 protons, 6 neutrons
6 protons, 8 neutrons
8 protons, 6 neutrons
Which statement is true for all ions?
They contain more neutrons than protons
They contain unequal numbers of protons and electrons
They are always positively charged
They are neutral particles
A sodium atom becomes Na⁺ when it…
gains a proton
gains an electron
loses a proton
loses an electron
Which term describes the weighted average of all naturally occurring isotopes of an element?
Mass number
Atomic mass
Atomic number
Charge
Which isotope of boron is more abundant if the atomic mass on the periodic table is 10.81?
B-10
B-11
Both equally abundant
Cannot be determined
Which element always has 8 protons?
Oxygen
Fluorine
Neon
Nitrogen
Which atom would be neutral?
11 protons, 11 electrons
12 protons, 10 electrons
10 protons, 12 electrons
9 protons, 8 electrons
The term “orbital” refers to…
The exact path of an electron
The most probable region where an electron is found
The shape of the nucleus
A fixed orbit from Bohr’s model
Which quantity is needed to identify the element uniquely?
Atomic mass
Mass number
Number of neutrons
Atomic number
Atoms are made up of three basic subatomic particles, which are
Match the following subatomic particles with their charges.
The center of an atom
Negative charge
Neutrons
No charge
Electrons
Positive charge
Made of one atom
Element
Protons
Nucleus
