How are chemical symbols written (number of letters & capitalization)
Chemical symbols are one or two letter abbreviations. The first letter is always uppercase and the second letter is not.
100
What is a period? How many are there?
A horizontal row on the periodic table- there are 7.
200
What makes up most of an atom's mass?
The nucleus or protons and neutrons
200
Name 3 element's atomic numbers.
answers will vary!
200
How were these elements arranged on the periodic table?
In order of increasing atomic mass.
200
Name 3 element's chemical symbols.
Answers will vary.
200
What is a group/family? How many are there?
A vertical column on the periodic table- there are 18.
300
What makes up most of an atom's volume?
The electron cloud or the cloud of electrons
300
What is an isotope?
Isotopes are atoms of the same element with the same number of protons but different numbers of neutrons.
300
Who discovered a way to measure the positive charges in an atom's nucleus?
Henry Moseley
300
Name the four pieces of information found in a box on the periodic table.
atomic number, chemical symbol, element name, atomic mass
300
Would an element have more in common with it's period or group?
Group
400
What is the unit of measurement for atoms and what does it stand for?
amu or atomic mass units
400
In any atom, which two particles are always equal?
protons and electrons
400
What does the term "periodic" mean?
In a regular, repeated pattern.
400
Why are atomic masses usually written as decimals?
They are written as decimals because they are averages of the isotope masses, and averages are usually decimals.
400
What do the purple boxes on the periodic table represent?
What do the yellow boxes on the periodic table represent?
What do the green boxes on the periodic table represent?
What is the weight of Carbon-15? Give your answer as a decimal.
15.003 amu
500
How many protons, neutrons and electrons are in Carbon-272?
Protons: 6 Neutrons: 264 Electrons: 6
500
Spell the name of the scientist who created the first periodic table.
Dmitri Mendeleev
500
What is the difference between atomic number, mass number and atomic mass?
Atomic number is the number of protons, mass number is the number of protons and neutrons and atomic mass is the average mass of all an element's isotopes.