4.10 unit test atoms part 1
How many protons are in this atom if it has a balanced charge?
6
What is the atomic number of an oxygen atom with 8 protons and 10 neutrons in its nucleus?
8
What happens if an atom loses a neutron?
Its mass is lowered, but it is still the same element.
What is the most basic building block of matter?
The atom
Why does radioactive decay occur?
The electric force and nuclear forces are in opposition to each other.
Item 1 Which statement best describes the electrons in this illustration?
The electrons are negatively charged particles located outside the nucleus.
What are carbon-12, carbon-13, and carbon-14?
different isotopes of the same element
Which part of an atom has a negative charge?
electron
Which term is defined as a substance that cannot be broken down chemically into a simpler substance?
element
Which term describes atoms with different atomic masses due to varying numbers of neutrons?
isotopes
What does the electron cloud model describe?
location where an electron has the highest probability of being found
Which term is defined as the sum of protons and neutrons in an atomic number?
mass number
What best describes the mass of an electron?
not significant to the overall mass of the atom
Which term is defined by the amount of a certain isotope that occurs in a natural sample of an element?
percent abundance
What are protons and neutrons compromised of?
quarks
What is the correct definition of a half-life?
the amount of time it takes for half of a radioactive substance to decay
What is the correct definition of nuclear fission?
the splitting of the atomic nucleus into parts
When does radioactive decay occur?
when the nucleus decays