WorksheetsUnderstanding the Atom
Total questions: 19
Worksheet time: 14mins
In an atom, the number of protons equals the number of
nuclei
electrons
neutrons
isotopes
Which particles in atoms have a negative electric charge?
electrons
protons
neutrons
nuclei
During radioactive decay, atomic nuclei of unstable isotopes
give off nuclear radiation
are broken down by radioactive bacteria
form chemical bonds
are unchanged
Two atoms of different elements will definitely have different numbers of
nuclei
protons
neutrons
electrons
Two neutral atoms that have the same atomic number and different mass numbers are
ions
isotopes
alpha particles
different elements
An ion that has a negative charge is formed when an atom
loses neutrons
loses electrons
gains neutrons
gains electrons
How is Bohr's atomic model different from Rutherford's model?
Bohr's model has a nucleus
Bohr's model has electrons
electrons in Bohr's model are located farther from the nucleus
electrons in Bohr's model are located in circular energy levels
An ________ is the smallest piece of an element
atom
proton
matter
All atoms of an element have the same number of
protons
electrons
neutrons
What is the smallest particle
electron
neutron
proton
Atoms of an element with different number of neutrons
isotope
ion
radioactive
What is #3
proton
neutron
electron
nucleus
What is #4
proton
neutron
electron
nucleus
The mass of an atom is the # of protons + ______________
# of electrons
# of neutrons
Which part of the atom makes up most of its volume?
its electron cloud
its neutrons
its nucleus
its protons
What did Dalton believe an atom was?
a solid, indivisible object
a tiny particle with a nucleus
a nucleus surrounded by an electron cloud
a tiny nucleus with electrons surrounding it
What does the figure show?
two different elements
two different ions
two different isotopes
two different protons
Whose model for the atom is shown?
Bohr's
Dalton's
Rutherford's
Thomson's
Which is true about the size of an atom?
It can only be seen using a scanning tunneling microscope.
It is about the size of the period at the end of this sentence.
It is large enough to be seen using a magnifying lens.
It is too small to see with any type of microscope.
