Subatomic Particles
What is the name of a particle that makes up an atom, such as a proton, neutron, or electron?
Subatomic Particle
Can mixtures be separated physically?
Yes
What are atoms of the same element with different mass numbers (different amounts of neutrons) called?
Example: Hydrogen-3, Carbon-14
Isotopes
What is the term for how many protons and electrons are in an atom?
Atomic Number
Which particle is negatively charged?
electron
Molecule of different elements?
compound
How is the number of neutrons determined?
neutrons = atomic mass - protons
Mass Number
What particle has no charge?
neutron
What do we call a pure substance made of one type of atom?
element
What are atoms that are radioactive and slowly change into more stable atoms over time called?
Radioisotopes
What are high-energy particles that travel through space and strike Earth's atmosphere, where they help produce radioactive carbon-14?
Cosmic Radiation
What particle orbits in shells?
electron
What type of change is melting ice?
physical
What is the transformation from an unstable to stable particle?
Decay
What is an explosive reaction where one atom is split into one or more other atoms?
Nuclear Fission
Which particles are found in the nucleus?
protons and neutrons
Is O₂ an element, molecule, or compound?
molecule
What is the time for half of the radioactive atoms in a sample to decay?
Half-life
What is a positively charged nuclei of helium atoms, consisting of 2 protons and 2 neutrons?
(Hint: it's a type of particle that Rutherford used in his gold foil experiment)
Alpha Particle