Unit prefixes
What does the prefix kilo- mean?
1,000 (or 10^3)
How many fundamental forces are there in physics?
4
What particle has a positive charge?
Proton
What are isotopes?
Atoms of the same element with different numbers of neutrons
Convert 3 km to meters
3,000 m
Which fundamental force keeps planets orbiting the Sun?
Gravitational
Where are electrons found in an atom?
What is the electron configuration of lithium (3 electrons)?
2.1
Convert 0.005 kg to grams
5 g
Which force holds the nucleus of an atom together?
Strong
Which particles are found in the nucleus?
Protons and neutrons
Two carbon atoms both have 6 protons, but one has 6 neutrons and the other has 8 neutrons. What are they called?
Isotopes
A microsecond (µs) is 10^-6 seconds. How many microseconds are in 0.002 seconds?
2,000 μs
Which fundamental force is responsible for electricity and magnetism?
Electromagnetic
What is the atomic number of an element?
The number of protons in the nucleus
Write the electron configuration of chlorine (17 electrons).
2,8,7
Convert 4.2x10^6 mm into kilometers
4.2 km
Which fundamental force causes radioactive beta decay?
Weak
An atom has 17 protons and 18 neutrons. What is its mass number?
35
An isotope of magnesium has 12 protons and 14 neutrons. What is its mass number, and how many electrons does it have if it is neutral?
Mass number = 26
Electrons = 12