1.6 Recall that most of the mass of an atom is concentrated in the nucleus Flashcards
(25 cards)
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.
