Atomic Structure
This subatomic particle has a positive charge
Proton
Isotopes of an element have different numbers of _____.
neutrons
Name of Group 1
Alkali Metals
This type of decay does not release a particle, but releases energy.
Gamma
Columns on the periodic table are called ____________.
Groups (or families)
The mass number is these two particles combined
protons and neutrons
What form is this isotope written in?
9Be
nuclear form
Which group number is the noble gases?
This is the time it takes for half of a radioactive sample to decay.
Half-life
Rows on the periodic table are called ________.
periods.
This particle has a negative charge
electron
What is the most common isotope of carbon?
Carbon - 12
Element Numbers 57 - 71 are called the __________.
Lanthanides
Fill in the missing piece of the equation below:
23892U --> 42 He + ______
23490 Th
This tells us the number of VALENCE electrons
Group Number
How many electrons can fit on the second energy shell?
8
What are the steps for calculating the average atomic mass?
1) divide % by 100
2) Multiply by mass
3) Add together
Hydrogen is part of the _____________ grouping.
Nonmetal
A sample has a half life of 5 years. How much of a 100g sample remains after 15 years?
12.5g
This tells us the number of electron shells (energy levels)
Period number
This particle determines the identity of an element
proton
How many neutrons are in this isotope?
Nitrogen - 15
8
This element is in Group 13 and Period 4.
Gallium.
How many half lives have passed for a sample to decay from 80g to 10g?
3 half lives
(80 -> 40 -> 20 -> 10)
1 2 3
Phosphorus has _________ valence electrons.
5