Inside the Atom
This subatomic particle has a positive charge.
What is a proton?
This number tells you how many protons are in an atom.
What is the atomic number?
These are atoms of the same element with different numbers of neutrons.
What are isotopes?
These are the three types of nuclear radiation studied.
What are alpha, beta and gamma?
This is the time taken for half of a radioactive sample to decay.
What is half-life?
This subatomic particle has no charge.
What is a neutron?
These particles are found in shells around the nucleus.
What are electrons?
This particle differs between isotopes of the same element.
What is a neutron?
This type of radiation can be stopped by paper or skin.
What is alpha radiation?
This fraction of a radioactive sample remains after one half-life.
What is one-half?
This subatomic particle has a negative charge
What is an electron?
An atom with atomic number 8 has this many protons.
What is 8?
This is an isotope that gives off radiation.
What is a radioisotope?
This is the most penetrating of alpha, beta and gamma radiation.
What is gamma radiation?
This amount remains from a 100 g sample after one half-life.
What is 50 g?
This part of the atom contains protons and neutrons.
What is the nucleus?
A neutral atom with 12 protons has this many electrons.
What is 12?
This process occurs when an unstable nucleus releases radiation.
What is radioactive decay?
This type of radiation consists of a helium nucleus.
What is alpha radiation?
This amount remains from an 80 g sample after two half-lives
What is 20 g?
This causes scientific models of the atom to change over time.
What is new scientific evidence?
An atom with mass number 23 and atomic number 11 has this many neutrons.
What is 12?
This type of isotope undergoes radioactive decay.
What is an unstable isotope?
This type of radiation has no mass and no charge.
What is gamma radiation?
This technique uses radioactive carbon to estimate the age of once-living material
What is radiocarbon dating?