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.

Which part of an atom has a negative charge?

electron

When does radioactive decay occur?

when the nucleus decays

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 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

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

Which term is defined by the amount of a certain isotope that occurs in a natural sample of an element?

percent abundance