Font size
WorksheetsUnit 1: Atoms and Atomic Structure
Total questions: 43
Worksheet time: 22mins
What is a negatively charge subatomic particle?
Electron
Neutron
Proton
A positively charged subatomic particle is called?
Neutron
Electron
Proton
A neutral subatomic particle is called
Neutron
Electron
Proton
(2 right answers) How did the concept of the atom change from the time of Democritus to the time of John Dalton?
Democritus lacked experimental support and was not based on the scientific method.
Democritus explained chemical behavior using experimental support
Democritus reasoned atoms could be divisible and indestructible
Democritus reasoned that atoms were indivisible and indestructible.
How do you find atomic number?
The number of protons in an atom
Electrons in the outermost energy level of an atom
A subatomic particle that has a positive charge and is found in the nucleus of an atom
the mass before a chemical reaction is equal to the mass after a chemical reaction
How do you find the mass number?
Bands of light formed as excited electrons return to ground state; used to identify elements
The sum of the protons and neutrons
A subatomic particle that has a positive charge and is found in the nucleus of an atom
Atoms of the same element with different mass numbers due to varying numbers of neutrons
What two subatomic particles are located in the Nucleus?
Protons and
Neutrons and Electrons
Protons and Neutrons
Quarks and Electrons
Who was the first person to propose the idea of an Atom?
Niels Bohr
Democritus
John Dalton
J.J Thomson
How do you find Atomic Mass?
A charged atom that has lost or gained an electron
the weighted average of the masses of an element's naturally-occurring isotopes
small, dense, positively-charged center of an atom
3D region where electrons are found
The small, dense, positively-charged center of an atom is called
Nucleus
Elect
Proton
Electron Cloud
The majority of the atom's volume is found in the
Electrons
Electron Cloud
Nucleus
Protons
What determines the mass of an atom?
Neutrons and protons
Electrons and protons
Neutrons and electrons
The electron cloud
Which scientist proposed this model?
John Dalton
Niels Bohr
Maria Goeppert-Mayer
Democritus
If an element had an atomic number of 5, how many protons does it have?
5
9
10
1
Most of the volume of the atom is ___
Empty Space
Nucleus
Protons
Neutrons
Whose atomic theory model is this? Hint: Hard sphere
John Dalton
Ernest Rutherford
J.J. Thomson
Democritus
Where are the electrons located in an atom?
Around the atom in orbitals
electrons are not part of an atom
Found inside the nucleus
Greek philosopher who named atoms from the word 'atomos'
Democritus
John Dalton
J.J. Thomson
Ernest Rutherford
This experiment lead to the discovery of the electrons
Cathode Ray Tube
Gold Foil Experiment
Bohr's Model
Saturanian Model
The current model of the atom is called
Plum Pudding
Planetary Model
The Electron Cloud model
Solid Sphere
Who discovered the subatomic particles called electrons?
J.J Thomson
Ernest Rutherford
John
Niels Bohr
What was the Plum Pudding Model and who proposed it?
To propose neutrality, the plum pudding model had sphere of positive charge and few negative elecrons scattered throughout the sphere - Thomson
To propose neutrality, the plum pudding model had sphere of positive charge and few negative elecrons scattered throughout the sphere - Democritus
To propose neutrality, the plum pudding model had sphere of positive charge and few negative elecrons scattered throughout the sphere - Dalton
To propose neutrality, the plum pudding model had sphere of positive charge and few negative elecrons scattered throughout the sphere - Bohr
Who name the postive subatomic particle ?
Ernest Rutherford
John Dalton
J.J. Thomson
Democritus
Which two scientists discovered the neutron was in the nucleus?
Rutherford and Chadwick
Chadwick and Bohr
Bohr and Rutherford
Dalton and Bohr
His model explains how electrons travel in defined circular orbits around the nucleus. In his model electrons have the ability to jump from one orbit to another by emitting or absorbing energy.
Bohr
Dalton
Rutherford
Thomson
The electron cloud model was developed in 1926. Its main purpose was to help visualize the most probable position of electrons in an atom. Which scientist helped make the Electron Cloud Model?
Erwin Schrödinger
J.J. Thomson
John Dalton
Ernest Rutehrford
What makes one element different from another?
Elements are different because they contain different numbers of protons.
Elements are different because they contain different numbers of electrons
Elements are different because they contain different numbers of neutrons.
Elements are different because they contain different numbers because they contain a different number of electrons and neutrons.
The number of protons must be equal to the number of electrons in an atom for it to be neutral?
True
False
The total number of protons and neutrons in an atom is called the
Mass number
Atomic Mass Unit
Nucleus
Proton
How can you determine an atom's composition?
Knowing the Atomic Number and Mass Number
Knowing the Atomic Number
Knowing the number of electrons
Knowing the mass number and electrons
Which is the CORRECT shorthand notation using atomic number and mass number?
712C
10144Ru
1020Ne
147N
How many protons, electrons, and neutrons are in Sodium --> Na?
Protons and Electrons: 11
Neutrons: 12
Protons: 11
Electrons: 12
Neutrons: 12
Neutrons and Protons: 11
Electrons: 12
Protons: 12
Electrons: 11
Neutrons: 23
How do isotopes of an element differ?
They have different number of protons.
They have different number of electrons.
They have different number of neutrons.
They have different number of protons and electrons.
Do isotopes have different mass numbers than a neutral atom (Element)?
Yes, they have a different of neutrons.
No, its the same.
No, but they have a different of neutrons.
Which two subatomic particles are responsible for chemical behavior?
Protons and Electrons
Electrons and Neutrons
Protons and Neutrons
Electrons
What happens when an atom (isotope) becomes unstable ?
They start a process called radioactive decay
They lose energy
Too many electrons
Holds all the energy and nucleus well (binding forces)
How are atoms of one element different from atoms of another element?
They all contain different number of protons.
They all contain different number of electrons.
They all contain different number of neutrons.
What is Average Atomic Mass (Atomic Mass)?
is a weighted average mass of the atoms in a naturally occurring sample of the element.
The number of eletrons and neutrons
weighted average mass of the atoms between two isotopes
The number of protons and electrons
To calculate the atomic mass of an element, multiply the mass of each isotope by its natural abundance, expressed as a decimal, and then add the products.
True
False
What is an Atomic Mass Unit (AMU)?
a unit of mass equal to one-twelfth the mass of a carbon-12 atom
a unit of mass equal to one-fourteenth the mass of a carbon-14 atom.
a unit of mass equal to one-eighth the mass of a oxygen-16 atom
a unit of mass equal to one-sixteenth the mass of a oxygen-16 atom
number of neutrons = mass number – atomic number
True
False
The atomic mass of an element is usually not a whole number because it is a weighted average of the masses of the naturally occurring isotopes of the element.
True
False
What is an instrument is used to observe individual atoms?
Scanning Electron Microscope
Light Microscope
Your own eyes
A Telescope
