Atomic structure (# of protons, neutrons, and electrons) Flashcards
Atomic structure (# of protons, neutrons, and electrons)
What is the atomic number of an element?
The atomic number is the number of protons in the nucleus of an atom.
True or False: The number of electrons in a neutral atom is equal to the number of protons.
True
Fill in the blank: The number of neutrons in an atom can be calculated by subtracting the atomic number from the ___ mass.
atomic
Which subatomic particle has a positive charge?
Proton
What is the charge of a neutron?
Neutrons have no charge (neutral).
How do you determine the number of neutrons in an atom?
Subtract the atomic number from the atomic mass.
Which subatomic particle is found in the nucleus of an atom?
Both protons and neutrons are found in the nucleus.
What is the mass of a proton compared to a neutron?
A proton and neutron have approximately the same mass.
True or False: Electrons are located in the nucleus of an atom.
False
What is the approximate mass of an electron?
The mass of an electron is about 1/1836 of a proton.
What determines the chemical properties of an element?
The number of electrons, particularly in the outer shell.
Fill in the blank: Isotopes of an element have the same number of protons but different numbers of ___.
neutrons
What is the significance of the atomic mass?
Atomic mass is the weighted average mass of an element’s isotopes.
In a neutral atom, how many electrons would an atom with 6 protons have?
6 electrons.
What is the relationship between protons and atomic number?
The atomic number is defined by the number of protons.
True or False: The number of protons can change in a chemical reaction.
False
What is the term for atoms of the same element with different numbers of neutrons?
Isotopes
How many protons are in a carbon atom?
6 protons.
Fill in the blank: The atomic number for oxygen is ___.
8
What happens to the charge of an atom if it gains an electron?
The atom becomes negatively charged (anion).
