1.6 Recall that most of the mass of an atom is concentrated in the nucleus Flashcards
What part of the atom contains most of its mass?
The nucleus.
True or False: Electrons contribute significantly to the mass of an atom.
False.
Fill in the blank: The nucleus is made up of __________ and neutrons.
protons.
What particles are found in the nucleus of an atom?
Protons and neutrons.
Multiple choice: Which of the following has the least mass?
Electrons.
What is the approximate mass of a proton?
1 atomic mass unit (amu).
What is the approximate mass of a neutron?
1 atomic mass unit (amu).
True or False: The nucleus is positively charged.
True.
What is the charge of a proton?
Positive.
What is the charge of a neutron?
Neutral.
Fill in the blank: The mass of an atom is primarily located in its __________.
nucleus.
Multiple choice: Which particle determines the atomic number of an element?
Proton.
How does the mass of an electron compare to that of a proton?
It is much smaller.
What is the combined mass of protons and neutrons in the nucleus called?
Atomic mass.
True or False: The nucleus occupies most of the volume of an atom.
False.
What is the term for the center of an atom?
Nucleus.
Fill in the blank: The nucleus contains __________, which are responsible for most of the atomic mass.
protons and neutrons.
Multiple choice: Which subatomic particle has no charge?
Neutron.
What is the main function of the nucleus in an atom?
To store protons and neutrons.
True or False: The nucleus is surrounded by a cloud of electrons.
True.
How many protons are in a hydrogen nucleus?
One.
What defines the identity of an element?
The number of protons in the nucleus.
Fill in the blank: The atomic mass unit is based on the mass of a __________.
carbon-12 atom.
Multiple choice: Which particle is responsible for the chemical properties of an atom?
Electrons.
What is the role of neutrons in the nucleus?
To provide stability.
