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
What radiation is made from high energy electrons from the nucleus?
beta
The mass number of an atom tells you…
the number of protons plus the number of neutrons in the nucleus of the atom.
The atomic number of an atom gives the number of ……. in a neutral atom.
Protons.
What is found in the nucleus with a relative mass of 1 and no charge?
Neutron
What is found orbiting around the nucleus with almost no mass and a charge of 1-
Electrons
What is found in the nucleus with a relative mass of 1 and a charge of 1+
Proton
How many protons, neutrons and electrons are in 65 ZN
Mass number (65) so Isotope of Zinc with 30 protons, 30 electrons and 35 neutrons.
