Atomic Structure Flashcards
What is the basic unit of matter?
An atom.
True or False: Electrons have a positive charge.
False.
Fill in the blank: The nucleus of an atom contains _____ and _____.
protons; neutrons.
What particle determines the chemical properties of an atom?
Electrons.
Which subatomic particle has a mass approximately equal to 1 atomic mass unit (amu)?
Proton.
Multiple choice: Which of the following particles is found outside the nucleus of an atom? A) Proton B) Neutron C) Electron D) All of the above
C) Electron.
What is the charge of a neutron?
Neutral (no charge).
True or False: Isotopes of an element have the same number of protons but different numbers of neutrons.
True.
What is the atomic number of an element?
The number of protons in the nucleus of an atom.
Fill in the blank: The mass number of an atom is the sum of its _____ and _____.
protons; neutrons.
Mass number (A) or Nucleon number is:
The number of protons and neutrons present in the nucleus of an atom.
An isotope is:
Atoms of the same element with the same number of protons and hence electrons but a different number of neutrons and hence nucleon number.
Work out the relative atomic mass (A^r) of an element.
(abundance of isotope 1 * mass of isotope 1) + (abundance of isotope 2 * mass of isotope 2) / 100
The group number of an element is determined by:
The number of electrons in the atom’s outermost electronic shell.
The period number of an element is determined by:
The number of electron shells an atom of that element has.
