WorksheetsAtomic Structure & Atomic Theory
Total questions: 30
Worksheet time: 27mins
All matter is made of what...
energy
atoms
molecules
compounds
The smallest unit of a pure substance that has the properties of that substance
particle
atom
compound
drop
What is the atomic number for an element with nineteen protons?
19
9
6
photons, neutrinos, and isotopes
ions, cations, and elections
positives, negatives, and in betweens
double
The central region of an atom where its neutrons and protons are is its
nucleus
electron cloud
core
center
Particles in an atom that are neutral and have no charge are
negatrons
electrons
neutrons
protons
A region around the nucleus of an atom where electrons are found.
Electron Headquarters
Electron Cloud
Electrical Wires
Electron House
If an atom has 39 protons, which of the following must it also have to be considered a neutral atom?
19 neutrons
39 electrons
12 protons
24 protons and neutrons
Which of the labeled structures is an electron?
a
b
c
If an element has an atomic number of 11 and a mass number of 23, how many neutrons does it have?
11
12
23
34
What is the atomic number for an element with twelve protons?
24
12
16
What did Ernest Rutherford discover about the atom when he conducted the gold foil experiment?
The "Plum Pudding" model was correct and electrons are like blueberries in a muffin
The atom has a small, positively charged nucleus at its center and most of the atom is empty space
The Heisenberg Uncertainty Principle only applies to atoms that don't have electrons
Protons are made of even smaller particles; like quarks, gluons, bosons and leptons
What is the sum of the protons and neutrons also called?
atomic number
chemical symbol
an isotope
atomic mass
Collectively, the particles that makeup an atom are called _________ particles
sub-atomic
microscopic
universal
electromagnetic
Atoms are the smallest unit of ______ that still has the properties of the same substance.
life
energy
matter
money
Which sub-atomic particle is represented by the symbol (+)
protons
neutrons
electrons
neutrinos
The last sub-atomic particle to be discovered was the neutron? Why do you think it was more difficult to detect than the proton or electron?
The Kinetic Theory of Matter states that neutrons are always vibrating and this makes it harder to see them
Neutrons are the only sub-atomic particle that does not reflect light so they are invisible
Neutrons are considered to be shy particles that don't like attention
Because neutrons have no charge, they do not respond to electromagnetic charges like electrons and protons, making them harder to detect
What are any of the various self-contained units of matter or energy that are fundamental parts of all matter. These particles include electrons, protons, and neutrons.
subatomic particles
elements
nucleus
electron cloud
What is the number of protons in the nucleus of an atom that determines the chemical properties of an atom?
mass number
atomic mass
atomic number
atomic symbol
JJ Thomson's work lead to the development of the "Plum Pudding" model and the discovery of which subatomic particle
proton
electron
neutron
Higgs-Boson particle
Why are electrons not factored into the mass of an atom?
Electrons move to fast to measure
Electrons have so little mass, they don't count toward the overall mass of the atom
Electrons have a negative charge that can't be weighed
Electrons are too far away from the nucleus
