Atomic Structure & Periodic Table Flashcards
Atoms always have an equal number of protons and…
electrons
The number of protons and neutrons is usually the same as well. Adding a proton to an atom makes a new element while adding a neutron makes an …………., or heavier version, of that atom.
isotope
What is the definition for the half-life of a radioisotope?
The time taken for half the mass/atoms of a radioisotope to decay.
Elements in the same group in the periodic table have the same number of…
Valence electrons
Beta radiation penetrates the skin by…..
a few mm
What radiation is made of a He nucleus?
Alpha
What radiation travels a long way in the air (km)?
Gamma
What radiation travels a short distance (a few cm in the air)
Alpha
Which radiation is made up of puer energy (electromagnetic energy) with no charge
gamma
Which radiation waves cannot penetrate the skin
Alpha
Which radiation travels right through the body
Gamma
Which radiation travels metres in air
Beta
Which radiation is stopped by lead or concrete
Gamma
Which radiation is stopped by skin, paper or clothing etc
alpha
Which radiation is stopped by wood, bone, and thin sheets of metal
beta
