No student devices needed. Know more
10 questions
Why are all atomic masses not nearly whole numbers?
This is due to the mass of all the electrons in the atom.
This is because of experimental error.
This is because atomic masses are the weighted average of the masses of all naturally-occurring isotopes.
This is due to binding energy of the atoms.
The atomic number of an element is defined by its number of ________.
protons
neutrons
electrons
nuclei
The sum of the protons and neutrons in a nucleus is __________.
the atomic number
the mass number
Avogadro's number
the element number
Which of the following is true for any atom?
atomic number = number of protons = number of electrons
atomic number = number of neutrons = number of electrons
mass number = number of protons = number of electrons
mass number = number of protons = number of neutrons
How is the atomic mass unit (amu) defined?
1/12 the mass of a carbon-12 atom
1/14 the mass of a nitrogen-14 atom
1/13 the mass of a carbon-13 atom
1/16 the mass of an oxygen-16 atom
If an atom has 9 protons, 10 neutrons and 9 electrons, what is its atomic mass?
9
19
18
10
Explore all questions with a free account