Atomic Structure
Which subatomic particles has a negative charge?
Electron
What is the name of the Group 2 elements?
Alkaline Earth metals
Define isotope.
Atoms of the same element with different numbers of neutrons
What are the three types of radioactive decay?
Alpha, Beta and Gamma
What is half-life?
The time taken for half a radioactive sample to decay.
What number determines an elements identity and position on the periodic table?
Atomic Number
Which group contains elements with one valence electron?
Group 1
How many neutrons are in Carbon-14?
8
What type of radiation has no charge and no mass.
Gamma
A sample start with 400 radioactive atoms. How many remain after one half-life?
200 atoms
An atom has 15 protons and 16 neutrons. What is its mass number?
31
Name the first three elements in group 2.
Beryllium, Magnesium & Calcium
What is the electron configuration of sodium?
2, 8, 1
What type of radiation can be stopped by a sheet of paper?
Alpha
A sample starts with 800 radioactive atoms. How many atoms remain after three half-lives.
100 atoms
What formula is used to calculate the number of neutrons in an atom?
Which element has the electron configuration 2,8,8?
Argon
Why are Carbon-12, Carbon-13 and Carbon-14 all carbon?
They all have 6 protons
What happens to an atom during beta decay?
It changes into a different element.
A radioactive sample decreases from 1000 atoms to 500 atoms in 4 years. What is its half-life?
4 years
An atom contains 20 protons, 20 neutrons and 20 electrons. Name the elements and states its atomic mass.
Calcium - 40
An element has the electron configuration 2,8,7. Which group is it in?
Group 17
An isotope has an atomic mass of 37 and an atomic number of 17. Identify the isotope.
Chlorine-37
Rank alpha, beta and gamma radiation from most to least penetrating.
Gamma --> beta --> Alpha
A radioactive sample starts with 3200 atoms and has a half-life of 5 years. How many atoms remain after 15 years?
400 atoms