Atoms
What is the name of the centre of an atom
Nucleus
What does the atomic number tell you about an atom?
Number of protons
How many electrons can the first shell hold?
2
What are isotopes?
Atoms of the same element with different numbers of neutrons
What is the chemical symbol for gold?
Au
What two subatomic particles are found in the centre of an atom?
Protons and neutrons are found in the nucleus
How do you calculate the number of neutrons in an atom?
Mass number minus atomic number
How many electrons can the first 4 shells hold, in order?
2, 8, 8, 2
True or False: Isotopes have the same atomic number but different mass numbers.
True
What metal is liquid at room temperature?
What is the charge of a proton, neutron and electron [100 points per correct answer]
Positive, neutral (no charge), negative
An atom of magnesium has an atomic number of 12 and a mass number of 24. How many protons, neutrons, and electrons does it have? [100 points per correct answer]
12 of each
What is the electron configuration of a carbon atom (atomic number 6)?
2, 6
Carbon-14 is used in radiocarbon dating. How is it different from carbon-12?
Carbon-14 has 2 more neutrons than carbon-12.
What is the only letter not found in any element’s symbol?
J
What is the name for the area around the nucleus where electrons are found?
Electron cloud or shells
Chlorine has an atomic number of 17. How many electrons are in a neutral chlorine atom?
17
How many electrons in the valence shell of sodium (atomic number 11)?
1
What might cause an isotope to be unstable?
Nucleus is too large or the ratio of neutrons to protons is too large
What is the smell of rotten eggs caused by?
Sulfur
What is the mass of an electron?
1/2000th of an amu
If an atom has 15 protons, 16 neutrons, and 15 electrons, what is its atomic number and mass number? [Both must be correct for the total points. No partial points].
Atomic number 15
Mass number 31
An atom has an electron configuration of 2, 8, 7. What element is it?
Chlorine
Which element has a name that sounds like a superhero?
THORium
Which element can blow up in water?
Sodium metal